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HARRY J BOSWORTH CO
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HARRY J BOSWORTH CO
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Publication date
Application filed by HARRY J BOSWORTH COfiledCriticalHARRY J BOSWORTH CO
Application grantedgrantedCritical
Publication of FR713090ApublicationCriticalpatent/FR713090A/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
G03B21/54—Accessories
G03B21/64—Means for mounting individual pictures to be projected, e.g. frame for transparency
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Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR713090D1931-01-051931-03-11Montures pour films radiographiques
ExpiredFR713090A
(fr)