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US2382116A
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Mounting for motion picture and sound projectors
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US2341301A
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Impedance or drag for cineprojectors
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US2344574A
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Cam flywheel and shutter for motion picture apparatus
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US2364495A
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Adjustable sound optics for cineprojectors
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US2070325A
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Projector for motion pictures
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US2120476A
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Safety device for projectors
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US2019280A
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Sound recording
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US2058193A
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Transmission mechanism and automatic throw-off for motion picture apparatus
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US1933400A
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Pick-up device for sound picture apparatus
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US2018043A
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Synchronizing motion pictures and sound records
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US1930544A
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Sound reproducing device for moving pictures
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US1825254A
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Intermittent feed for motion picture apparatus
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US1824519A
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Reel mounting for motion picture projectors
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US1855267A
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Adjustable reel arm for motion picture apparatus
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US1855268A
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Film tension control
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US1781937A
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Film sprocket structure
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US1812068A
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Footage indicator for motion-picture cameras
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US1923855A
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Film control device
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US1855269A
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View findee and leveler
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US1918724A
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Projecting motion pictures in color
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