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US2897719A
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Film guides
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GB783568A
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A film strip guiding apparatus for cinematograph cameras and projectors
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US2685229A
|
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Photographic objective of three air spaced subassembly members in axial alignment
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GB714550A
|
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Photographic objective
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US2764912A
|
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Photographic objective comprising front and rear lens systems axially spaced at a fixed distance
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US2718173A
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High intensity five component photographic objective
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US2737849A
|
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Photographic objective
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US2603127A
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Projection lens-system corrected for spherical, chromatic, comatic, astigmatic, and distortional aberrations
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US2651970A
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Highly corrected image producing photgraphic objective system
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GB653819A
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Improvements in or relating to optical systems
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CA519406A
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Image producing, spherically and chromatically corrected optical system
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