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Publication of FR551990ApublicationCriticalpatent/FR551990A/fr
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
G03B21/20—Lamp housings
G03B21/2053—Intensity control of illuminating light
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Engineering & Computer Science
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Physics & Mathematics
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General Physics & Mathematics
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FR551990D1922-05-241922-05-24Perfectionnement aux appareils cinématographiques
ExpiredFR551990A
(fr)