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Publication of FR1055665ApublicationCriticalpatent/FR1055665A/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
G03B21/10—Projectors with built-in or built-on screen
G03B21/11—Projectors with built-in or built-on screen for microfilm reading
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Physics & Mathematics
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General Physics & Mathematics
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FR1055665D1952-05-101952-05-10Appareil de projection, notamment pour l'observation de documents sur microfilms
ExpiredFR1055665A
(fr)