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US2227237A
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Photographic shutter brake
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US2232354A
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Cooling chamber for microscopes
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US2252449A
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Rapid shutter winding device for cameras
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US2237943A
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Intermediary optical system for microscopes
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US2242043A
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Exposure meter for photographic apparatus
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US2234578A
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Cooling chamber for microscopes
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US2240707A
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Electric lamp for picture projection
|
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US2227269A
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Fire protection device for motion picture projectors
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US2245871A
|
|
Focal plane shutter
|
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US2256226A
|
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Focal plane shutter
|
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US2256207A
|
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Roll film camera with spring motor
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US2252573A
|
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Motion picture camera with exposure meter
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US2227240A
|
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Transmission mechanism for cameras
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US2224674A
|
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Camera flashlight synchronizer
|
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US2221609A
|
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Photographic view finder
|
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US2217236A
|
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Photographic exposure meter
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US2211867A
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Shutter mechanism
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