1. 1
BRIGHT NIGHT
Bright Night is an easily brandable wrist torch. Whether used for the late
night walk home or for raving, it is the perfect handsfree accessory.
Adam Coleberd (1021564)

2. Contents
Brief
The Problem
First Initial Solutions
Existing Products
The Use
Market research
Research based ideas
Human Factors
Electronics
Development Protomold Analysis
Material Choice
Printing
Manufacturing Methods
Manufacturing Systems
Final Product
BPMA Proposal
Concept Board
Manufacture & costing
General Arrangement Drawing
References
3
4
5
6
7
8
9
10
12
14
18
19
20
21
22
24
25
26
27
28

3. 3
Brief
Produce a new innovative promotional
product which can be manufactured
for £2.50 or under suitable for
manufacture of 10,000 to 100,000
units.

4. 4
The Problem
On the way home from a night out I was walking along
the street, which in West Dorset is usually a dark, fairly
quiet street. I made it to my door and stood there
thumbling with my keys. The challenge was finding the
keyhole and getting the right key in to be able to unlock
the door. This has happened many times to myself,
although the dark streets isn’t always an issue, often
finding the keyhole and the right key is.
After discussing this issue with my parents and other
family members, it was clear it wasn’t just myself
that suffered this problem. When talking about the
issue with my sisters, they highlighted the fact that
sometimes they feel a little uneasy when walking along
dark streets alone.
I suggested the idea of them carrying a little torch in
their handbag.
The main argument against carrying a torch was that
it would take up space and also mean the effort of
looking through their bag to find it and another thing to
just have the hassle of, particularly when intoxicated.
I asked were they against perhaps using a torch if it
wasn’t as much effort to have on them.
They said yes, as long as it wasn’t a restricting object.
Updated Brief
- Produce a torch which is unrestricting.
- Practical.
- Low hassle.

5. 5
First Initial Solutions
Sketches of first ideas were from traditional torches to
lights which attached to an ear or finger.

6. 6
Existing Products
All of the products pictured are sold for no more than
£3. They are predominantly little torches with extra
functions, making them more desirable as a product.
These products show that there is not only an obvious
market for handy torches, but also that they can be
manufactured under our brief unit price of £2.50.
Charity wrist bands have taken off in a big way and
have been very popular for several years now. Cheap
to produce and easily branded. They have developed
into other items such as usb wristbands as shown
below which are already given away as promotional
products by some companies.
Rebel Patents Wristband Torch.
This seemed to be the only vaguely similar torch i could
find to my initial ideas. It is very bulky, but also includes
extra features such as flashing amber lights. It uses 3 x
AAA batteries.

7. 7
The Use

8. 8
Yes
No
Yes
No
Yes
No
Yes
No
Do you already or are you happy to wear something
on your wrist?
Have you ever needed a torch but haven’t had one on
you?
Do you struggle to find your keys or your door lock in
the dark?
If you are ever on a night out or at a festival, do you ever
hold or wrap glowstocks around your wrists?
Market Research
2011 Sales by Product Category
2010 figures in brackets.
Above is the estimated figures of promotional products
distributor sales by category for 2011 collated by PPAI.
This market was worth:
$17.72 Billion
An estimated 29.64% was made up of wearable
products, such as t-shirts, neck wear, head and wrist
bands. To be able to have a product within this kind of
size market would be a significant boost.
Other markets this product could have the potential to
hit are: Personal and Electronic.
These 3 markets have a combined market share of
34.52% equals an estimated $6.12 Billion.
Knowing the potential market size of the product,
some more in depth market research was done. This is
all shown above. It shows that most people are happy
to wear something on their wrist and that the majority
have also needed a torch when they haven’t had one.
This gives a clear indication that their is potential for this
product. It is shown that the majority of people asked
in this survey have worn or held glowsticks, and have
at some point struggled to find keys or the door lock
when it is dark. This immediately confirms that the
potential market for clients to use this product as a
promotion of their company extends into other areas
which have been previously highlighted.

9. 9
This shows the movement from initial solutions to the
ideas developed from the market research. A wrist
torch, realised into an idea. Using photoshop and a
quick CAD model to show a better representation of
the potential product.
Research Based Ideas

10. 10
Human Factors
The product needs to fit peoples wrists, because of
similar items such as charity wristbands, it makes
sense to base the dimensions on those of the bands.
Additional anthropometric data was collected. Pictured
below is the data of:
1% women (smallest) to 99% men (biggest).
Its shows a hand width range of 69mm to 99mm.
Wrist width of 51mm to 76mm.
The band needs to be able to get over the hand whilst
also being able to be relatively tight on the wrist to
stay on. Most charities focus predominantly on the
adult wrist bands as this size would then fit all although
maybe loose on some.
Looking at www.gowristbands.co.uk, a leading
wristband manufacturer, they produce the following
sizes for adults:
202mm - Adults
192mm - mostly Women and Young Adults.
Go wristbands also only produce two widths of
wristbands which are 12mm and 25mm. This is a good
guide for the width of the band of the product. These
sizes are both comfortable and sustain everyday wear.
The torch block on one part of the band will need to be
wider than the rest of the band. Knowing 25mm has
a sustained market as a wristband shows that having
a part of the product as wide as that on the wrist is
acceptable. Although comparitive products such as
watches can be much larger in size.

11. 11
Bright Night will guide you home

12. 12
Electronics
The product needs to fit peoples wrists. because of
similar items such as charity, it makes sense to base
the dimensions on those of the bands.
Below shows the break of the main electronic
components in this multi function camping torch.
The electronics is more complex than needed for my
product as it contains an LED on each end, which both
have separate functions. All controlled from the single
button with multiple presses. I have pictured the main
electronics including the space for the cell batteries on
my wrist, to show size.
Above shows a couple demonstrations of 3 and 2
LED circuits. The 3 LEDs shown needed 7.5V to light
them. The 2 LEDs needed only 5V. There will be limited
space in the cavity for the cells which will power the
LEDs. If the LEDs were in parallel, the Voltage required
would be reduced.
Below shows the use of a small button in the 2 LED
series circuit. A button will be placed below the top
edge of the cavity. As the material of the main body is
flexible, when the top is pressed it will press the button
switching on/off the light.
After talks with an electrical engineer, the circuit was
discussed and the LEDs were put into parallel, this
meant using 3volt LEDs that 2 or 3 could be run off
one 3volt cell. The engineer also noted that the use of
a 150 ohm resistor in series with each 3volt LED would
reduce the chance of failure. This is due to the resistor
reducing the current flow sufficiently. The engineer
gave prices for LEDs which would be under £0.05
each and that a PCB would cost for this application
£0.08, and the flow soldering would be around £0.10.
The suppliers RS components and Rapid components
were suggested for the other items.
In order to make a PCB first you must make a
schematic diagram of the circuit you wish to have
printed, it is then transferred on computer software
such as Easy Peasy. The file is then sent to print which
prints the desired circuit on the board. Hence why it is
called a printed circuit board.
The PCB would then have the required components
placed in position on it, the legs of the components
would then be bent over to avoid risk of the
components falling out.
The boards would then be placed on a conveyor in a
flow soldering machine. This takes the board and as
shown overleaf, sprays flux on the components legs
and track, it then undergoes heating. This process
helps the solder flow along the required paths. Molten
solder which is pulsated to cause a wave, touches
the tracks and flows where required soldering the
components in place. This is a very time saving
manufacturing process. Ideal for the manufacture of
a 100,000 units. Manual soldering would be very time
consuming and labour cost would be increased.

13. 13
Component
LED
Switch
PCB
Cell
Manufacture
Cost
£0.05
£0.14
£0.08
£0.25
£0.10
Quantity
2
1
1
1
TOTAL
Total
£0.10
£0.14
£0.08
£0.25
£0.67
Electronics
A prototype of the intended circuit was made to test
the theory of components would work.
The total from the values found
and the suggested values by the
engineer come to £0.67 per unit.
When looking at the product
on the previous page. This was
bought for £1.00.
Bearing in mind that a product at market has usually
over a 50% profit margin. Then taking into account
shipping and handling. The product which also had
some injection moulded parts, would have cost a lot
less than the full costing opposite. Although it is that
costing which will be taken forward as the guide for the
product. With the information here in mind.
The circuit was made using a push to make switch.
For the actual product a on/off switch would be used
The image above demonstrates a single LED torch
which was bought powered by 3 small button cells.
This demonstrates that the proposed 2 LED torch
would be bright enough to make a difference.

14. 14
Development Protomold Analysis
The initial CAD model was sent for quotation to
Protomold. They sent back a full quotation along with
a full analysis of the components. They highlight the
issues with the model and explain the changes needed
to be able to carry out a better quality moulding.
Below shows the initial model which was sent for analysis. This shows how a draft
angle is needed for easier removal from the mould giving a better quality end result.
The image shows the modification made to the strap giving a small draft angle from
the centre split line out. Allowing an easier realise from the mould.
Draft angles were added where highlighted by protomold.

15. 15
Protomold highlighted the issue of an undercut on the model, which wouldn’t be
able to be moulded.
The product was re-modelled without the undercuts. Shown below.
Another potential issue highlighted by Protomold was that the parts
in dark blue were thicker than nominal. With the new model, the
thickness was decreased with a larger wider internal cavity which
minimises the thicker areas. Also allowing a better space for the
electronic components.

16. 16
Development Protomold Analysis continued
Injection Moulding is the process Protomold use.
However, they do not mould silicone. The pieces were
still analysed for their costing evaluation and analysis
of the components themselves as shown previously.
Protomold Costing
Main Body
Tooling price: £1,627.00
Based on the use of:
ABS, Clear (Polylac PA-758)
Quantity based unit price:
1,000 £1.76
10,000 £1.15
100,000 £1.10
Lens
Tooling price: £959.00
Based on the use of:
Acrylic (PMMA), Clear (Plexiglas 6N)
Quantity based unit price:
1,000 £1.45
10,000 £0.86
100,000 £0.83
Add £333.00 setup charge to each lot of production
parts.
Due to Protomold not having the desired material,
using the settings in SolidWorks, the density was
changed to that of Silicone 2329Kg/m . Using this the
programme worked out the weight of the main body
allowing a calculation of cost for silicone using the cost
per tonne price.
Main Body
Cost per tonne = £2100.00
Kg = £2.10
g = £0.0021
x 29.20
= £0.06132
Based on the use of:
Silicone
Although this cost is considerably less than Protomold,
it doesn’t include labour costs. A cost for silicone
moulding was unavailable as most suppliers wouldn’t
take my proposed concept seriously I believe due to
asking for the numbers I needed.
The lens had no major issues that needed looking
at from the protomold analysis. The only potential
issue was the thickness highlighted in blue. But it is
something, that is only a worry. More than likely would
be fine. It is something that after an initial batch could be
looked at should sinking be an issue.
The lens could be glued into position by hand using
a silicone adhesive. Once the electronics would be
in place. Talking to a Modelling specialist, it would be
a minimal amount to adhere the two components. A
suitable sealant is about £4.50 for a large tube.

17. 17
Another potential process which could be used for the
manufacture of the main body and lens of the product
is compression moulding. Although slightly different
processes would be used for the
This is when an excess amount of rubber is placed into
one half of the mould and then is compressed using
the other half of the mould along with being heated.
The excess amount of material gives a thorough and
even distribution around the mould. When the pressure
and heat is removed the product is released from the
mould.
When using rubber it is a slower process than using
plastics. Rubber would have an expected 10 minute
cycle time compared to 2 minutes for plastics.
Costing for compression moulding is roughly 3-4 times
the material cost. With what is described as moderate
tooling costs. Injection moulding would generally
have a higher tooling cost although does depend on
cavities. Injection moulding would generally have a
better surface finish.

18. 18
Material Choice
Material
Polypropylene
LDPE
Silicone
Natural Rubber
Cost/Tonne
£620
£1017
£2100
£1980
Density (Kg/m )
905
920
2329
1100
Flexible
Semi
Semi
Yes
Yes
The material selection for the main body of the product
is based upon products which already exist. All four
materials listed are ones which can be manufactured
using common mass manufacturing processes. The
main ones to produce the intended product would be:
- Injection moulding
- Compression moulding
- Blow moulding
Material
Polypropylene
HDPE
Acrylic
PET
Cost/Tonne
£620
£1097
£985
£560
Density (Kg/m )
905
960
1150
1455
Flexible
Semi
Semi
Semi
Semi
The selection of material for the lens is a little more
complex as there are a few materials capable of
producing the component desired. PET is often
for bottles whilst, HDPE is mainly for use for similar
purposes but also chopping boards and such like.
Glass although a very good material for lenses, it
isn’t in this case the best material for the job. Without
additional processes, it is a very brittle material. This
isn’t suitable for a product which may be thrown out to
people in crowds.
Main Body/ Strap
Lens
Final Choice Material
Silicone
The product most similar to the intended main body is
the charity bands previously looked at. These are made
from silicone. Although the most expensive material
highlighted, it is fully flexible unlike the two cheapest
materials. The full flexibility would allow the product to
easily be taken on and off the wrist without a potentially
expensive connector. Being able to keep the part as
one piece, minimises processes. For these reasons
Silicone will be used to make the main component of
this product.
Acrylic
The lens will be made from acrylic, it gives a great
finish when injection moulded. Although not the
cheapest material, the costing from protomold is
acceptable. Knowing a increased lead time could also
bring this cost down. Acrylic is also the most common
material mentioned used for lenses, which makes it
the superior choice.

19. 19
Product Data Sheet
Sylub Inks for Silicone Rubber
The Products
These inks are available for the screen or pad printing of silicone rubber. They are
supplied as a 2 pack consisting of Sylub Ink and Sylub Catalyst.
Special Features
 High Gloss
 Good colour strength
 Cures to give excellent adhesion to silicone rubber
 High lightfastness
Printing Information
Mix 10 parts of ink to 1 – 1.5 parts of catalyst by weight. The silicone rubber surface
should be clean and degreased by wiping with iso-propyl alcohol and allowed to dry
completely. The rubber may now be printed in the normal way with the prepared
mixed ink. Care should be taken not to handle the rubber surface or allow any grease,
oils or contaminants to come into contact with it. Mixed ink and catalyst should be
printed and cured within 4 hours of mixing. Duration of cure will depend on the
system of heating used but could be 20 minutes at 200C. Adhesion could if necessary
be further improved by extending the curing time.
Store unmixed ink and catalyst below 27C for maximum shelf life.
After Printing Information
Rub resistance Yes
Water resistance Yes
Elasticity Yes
Popular Basic Colours Product Codes Pack Size
Sylub Black 80-SD153 1 Kilo
Sylub White 80-SD154 1 Kilo
Sylub Catalyst 80-SD116 150 mls
Other colours can be supplied to match individual requirements
The above information on this Product Data Sheet is given as a guide only and it is recommended that
the inks are tested under the user’s normal conditions to ensure that they are satisfactory for the
purpose intended.
Silicone Inks Ltd. Tel/Fax +44 (0)1732 364564. www.siliconeinks.com
23 Cranford Road, Tonbridge, Kent, United Kingdom, TN10 4HL
Printing
The choice of material for the main body of the product
was silicone. Because of its properties, it requires
special inks. Contact was made with a company
called Silicone Inks Ltd. The following information was
recieved about the inks they can supply. Including a
possible printing process.
Mixing Preparation
(2 component ink)
The required mix ratio is ten parts by weight of ink to one part by weight
of hardener. When machine mixing, avoid prolonged high speeds. Placing
the material in a closed container in a cool (below 50°F) environment
will extend the mixed pot life. The separate components may be stored in
closed containers up to one year at room temperature (72°F). Adhesion
improves with increased post curing. Because pigments can settle during
storage is suggested that the Silicone Ink be stirred before use. Add the
hardener to the ink to assure complete dispersion. Mixing may be done by
hand with a spatula or by machine. Avoid stirring in an excessive amount
of air.
Thinner: If the mixed viscosity is too thick for a specific application,
SI Solvent is available to custom design the viscosity for a specific
application. Ink Solvent is environmentally friendly. It has zero VOC and
will not adversely affect the adhesion of the system.
Attention: the use of any solvents or retarders other than those in SI series
may adversely affect printing and adhesion.
Drying: Silicone Ink must be dried at 204°C (400°F) for 2 – 6 minutes.
Caution: contact with some materials will inhibit the drying of Silicone
Ink. These include: silicone RTV containing organo-tin catalysts, sulfur-
containing compounds, amines, some urethanes, and organic acids. A
small-scale compatibility test is always recommended.
This is another process for the mixing of ink suitable for
use on silicone. This was found on www.inkcups.com.
The process states a drying time could be as little as 2
minutes in the right conditions. This would dramatically
reduce the manufacture time. The process would be
screen printing the silicone body of the product.
Product on a revolving holder.
Stencil
Squeegee
Ink
The above image is a very simplified demonstration
of the screen printing process which is repeated with
each colour ink and different stencils to make up the
image intended. Even though for mass manufacture,
screen printing is still seen a quite manual process due
to the need for control and movement of components.
Depending on the print, it would cost roughly £0.10.
With reference to www.dowcorning.com, screen
printing is potentially one of the best ways to print
silicone,

20. 20
Manufacturing Methods
The decision was made for the use of injection
moulding to make the main body of the product. The
reason for the decision was that it is a process which
gives a very high quality finish. It has a low wastage and
is a common process.
As shown in the image the process is explained.
The difference between the two components, the
main body and lens is the material used. The intended
design of the parts will also not require the pictured
top action core. As both parts can be simply moulded
using only a two part mould.
The material is loaded into the Hopper above a heated
driven corkscrew. The material then is released into
the corkscrew, which moves the material to the nozzle
end. Material is then injected into the mould filling the
cavity. The two part mould will be cooled, the gate at
the end of the corkscrew will be closed and the mould
will be pulled apart and the new moulded part released.
Although the tooling may cost more than other
methods, it gives a superior finish than methods such
as compression moulding.
Overall Costing
Main Body
Electronics
Lens
Printing
TOTAL UNIT:
TOTAL 100,000:
£0.06132
£0.67
£0.83
£0.10
£1.66132
x 100,000
= £166,132.00
Tooling
TOTAL:
TOTAL 100,000:
£959.00
£1627.00
£2586.00
+
£166,132.00
£168,718.00
This costing is not fully accurate as
it has been hard to get contact with
suppliers which deal with silicone.
Even after e-mailing and follow up
calls. Getting the figures required was
difficult.

21. 21
Manufacturing Systems
Just In Time is a manufacturing system in which materials
are purchased and units are produced only as needed to
meet actual customer demand.
In a just in time manufacturing system back stock is
reduced to the minimum and in some cases are zero.
JIT approach can be used in both manufacturing and
merchandising companies. It has big effects, however,
on the operations of manufacturing companies which
maintain three class ofback stock -raw material, work in
process, and finished goods. Traditionally, manufacturing
companies have maintained large amounts of all three
types of inventories to act as buffers so that operations
can proceed smoothly even if there are unanticipated
disruptions. Raw materials inventories provide insurance
in case suppliers are late with deliveries. Work in process
inventories are maintained in case a work station is unable
to operate due to a breakdown or other reason. Finished
goods inventories are maintained to accommodate
unanticipated fluctuations in demand. While these
inventories provide buffers against unforeseen events,
they have a cost. In addition to the money tied up in the
inventories, experts believe that the presence of back
stock encourages inefficient and sloppy work, results in
too many defects, and dramatically increase the amount of
time required to complete a product.
Just-In-Time Concept:
Under ideal conditions a company operating a JIT
manufacturing system would purchase only enough
materials each day to meet that days needs. Moreover,
the company would have no goods still in process at the
end of the day, and all goods completed during the day
would have been shipped immediately to customers. As
this sequence suggests, "just-in-time" means that raw
materials are received just in time to go into production,
manufacturing parts are completed just in time to be
assembled into products, and products are completed just
in time to be shipped to customers.
Although few companies have been able to reach this
ideal, many companies have been able to reduce back
stock only to a fraction of their previous level. The result has
been a substantial reduction in ordering and warehousing
costs, and much more efficient and effective operations.
In a just in time environment, the flow of goods is controlled
by a pull approach. The pull approach can be explained as
follows. At the final assembly stage a signal is sent to the
preceding work station as to the exact amount of parts
and materials that would be needed over the next few
hours to assemble products to fill customer orders, and
only that amount of materials and parts is provided. The
same signal is sent back to each preceding workstation
so a smooth flow of parts and materials is maintained
with no appreciable inventory buildup at any point. Thus
all workstations respond to the pull exerted by the final
assembly stage, which in turn respond to customer
orders.
The pull approach described above can be contrasted to
the push approach used in conventional manufacturing
system. In conventional system, when a workstation
completes its work, the partially completed goods are
pushed forward to the next work station regardless of
whether that workstation is ready to receive them. The
result is an unintentional stockpiling of partially completed
goods that may not be completed for days or even
weeks. This ties up funds and also results in operating
inefficiencies. For one thing, it becomes very difficult
to keep track of where every thing is when so much is
scattered all over the factory floor.
An other characteristics of conventional manufacturing
system is an emphasize on "keeping every one busy" as
an end on itself. This inevitably leads to excess inventories
particularly work in process inventories. In Just in time
manufacturing, the traditional emphasize of keeping
everyone busy is abandoned in favor of producing only
what customers actually want. Even if that means some
workers are sat doing nothing.
Advantages:
Investments that were tied up in back stock can be used
elsewhere.
Areas previously used, to warehouse components and
products can be used for other more productive uses.
Defect rates are reduced, resulting in less waste and
greater customer satisfaction.
As a result of advantages such as those cited above, more
companies are embracing just in time manufacturing
system each year. Most companies find, however, that
simply reducing back stock is not enough. To remain
competitive in an ever changing and ever competitive
business environment, must push for continuous
improvement.

22. 22
Final Product
Strengths
- Clear advertising space.
- Able to be relatively simply re-sized.
- Large potential client base.
- Practical and fun product.
- Large amount of opportunities.
- Intuitive switching on/off.
Opportunities
- Could be modified with different colour LEDs.
- Larger and smaller versions could be made.
- Additional features could be added such as flashing
lights.
- Apart of a campaign for safety.
- Different colours could be used for different
companies.
- Ultra-Violet light could be used.
- Possibility for replacing cells.
Weaknesses
- Battery life will limit life time.
- Silicone can tear under excessive strain.
- Limited light output.
- The sizing could mean it is loose or tight for some.
Threats
- The use of small torches.
- Consumers may not use the product.
- The limited battery life.
- Companies may feel it is not appropriate or useful.
- Cheaper bands without the torch. (Plain bands)
-

24. 24
BPMA Proposal
Concept Board
Manufacture & Costing
General Arrangement Drawing

25. BRIGHT NIGHT
Bright Night is an easily brandable wrist torch. Whether used for the late
night walk home or for raving, it is the perfect handsfree accessory.

26. 26
Manufacturing Methods
The decision was made for the use of injection
moulding to make the main body of the product. The
reason for the decision was that it is a process which
gives a very high quality finish. It has a low wastage and
is a common process.
As shown in the image the process is explained.
The difference between the two components, the
main body and lens is the material used. The intended
design of the parts will also not require the pictured
top action core. As both parts can be simply moulded
using only a two part mould.
The material is loaded into the Hopper above a heated
driven corkscrew. The material then is released into
the corkscrew, which moves the material to the nozzle
end. Material is then injected into the mould filling the
cavity. The two part mould will be cooled, the gate at
the end of the corkscrew will be closed and the mould
will be pulled apart and the new moulded part released.
Although the tooling may cost more than other
methods, it gives a superior finish than methods such
as compression moulding.
Overall Costing
Main Body
Electronics
Lens
Printing
TOTAL UNIT:
TOTAL 100,000:
£0.06132
£0.67
£0.86
£0.10
£1.69132
x 10,000
= £16,913.20
Price per unit based upon 10,000 units is:
£1.69132
This cost doesn’t include a silicone manufacture
process, only the material due to being unable to get
contact with the required people.
With the two main components injection moulded
and the PCB made and soldered using flow
soldering. The main body can go for printing. The
electronics and lens can be slotted into place and
glued. The product is then ready. Press the top and
the torch should work.

27. 27
General Arrangement Drawing
24
73
A
A
30
SECTION A-A
SCALE 1 : 1
12 3
ITEM NO. PART NAME Material QTY.
1 Main Body Silicone 1
2 Lens Acrylic 1
1
WEIGHT:
A3
SHEET 1 OF 1SCALE:1:1
DWG NO.
TITLE: Bright NightREVISIONDO NOT SCALE DRAWING
MATERIAL: Refer to parts listDATESIGNATURENAME
DEBUR AND
BREAK SHARP
EDGES
FINISH: Refer to parts list.
UNLESS OTHERWISE SPECIFIED:
DIMENSIONS ARE IN MILLIMETERS
SURFACE FINISH: Refer to Part list.
TOLERANCES:
LINEAR: 0.1
ANGULAR: 0.5
DRAWN
3 Electronics PCB and components
Finish
Tool marks removed.
Tool marks removed.
o
+
-
Adam Coleberd

28. 28
References
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