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KOLMAG AG
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KOLMAG AG
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Application grantedgrantedCritical
Publication of FR683796ApublicationCriticalpatent/FR683796A/en
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
G03B21/00—Projectors or projection-type viewers; Accessories therefor
G03B21/14—Details
G03B21/32—Details specially adapted for motion-picture projection
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Physics & Mathematics
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General Physics & Mathematics
(AREA)
FR683796D1929-10-081929-10-23
Device for winding and unwinding endless belts with perforations
ExpiredFR683796A
(en)
Simultaneous winding and unwinding device for endless cinematographic film, with intermittent stop system, automatic resumption of movement and automatic start stop