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US1843972A
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Talking motion picture apparatus
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US1929626A
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Soundproofing picture recording camera
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US1777037A
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Binaural recording and reproducing sound
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US1897363A
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Luminous discharge device
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US1802595A
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Automatic photographic sound-reproducing mechanism
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US1764938A
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Method of producing talking-motion-picture films
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US1692256A
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Slit block
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US1683621A
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Fine-slit construction
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US1683451A
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Sound recording and reproducing apparatus
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US1683620A
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Slotting and slitted light transmitter
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US1812687A
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Sound-chamber and set-frame therefor
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US1629152A
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Slot cleaner for motion-picture machines
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US1695415A
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Talking-motion-picture record
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US1695414A
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Talking moving-picture machine
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US1642363A
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Telephone device
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US1693071A
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Sound-recording attachment for motion-picture cameras
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US1659910A
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Slot cleaner for phonofilm attachments for motion-picture machines
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US1693072A
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Means for shielding sound detector and amplifier apparatus
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US1653155A
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Talking-moving-picture equipment
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US1659909A
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Film-protecting arrangement
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