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US3756715A
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Tape recorder with control device for a slide projector
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GB1278520A
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Slide projection apparatus
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US3623803A
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Projection apparatus
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FR1412318A
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Projection device
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FR1404201A
|
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Projection device
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FR1389994A
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Transparency projection device
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FR1378340A
|
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Device to project line by line
|
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GB1024439A
|
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Optical projection apparatus
|
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DE690848C
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Device for regulating the voltage of AC circuits
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FR794130A
|
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Device operating during variations in electrical voltage
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GB190415925A
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Improvements in Friction Clutches.
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GB190408694A
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Improvements in or relating to Alternating Current Arc Lamps.
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GB190408693A
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Improvements in or relating to Electric Arc Lamps.
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DE77C
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Construction of double ring shrapnel
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