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DE743322C
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Beam splitting system for cameras for three-color photography
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Portable projection device for picture sound films
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Improvements in or relating to photographic enlarging or reducing apparatus
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Improvements in or relating to negative carriers for photographic projection printing apparatus and enlarging apparatus
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Image holder on projection and enlargement devices
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Device for adjusting telescopes using optical wedges
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Photographic camera for three-colour photography
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Beam splitting system for cameras for three-color photography
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Improvements in or relating to portable projection screen assembly for daylight projection
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US2225012A
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Portable device adapted for daylight projection
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