Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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Filing date
Publication date
Application filed by Electrical Research Products IncfiledCriticalElectrical Research Products Inc
Application grantedgrantedCritical
Publication of FR728114ApublicationCriticalpatent/FR728114A/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
G03B21/32—Details specially adapted for motion-picture projection
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR728114D1930-12-121931-12-11Dispositif destiné à l'observation ou à la projection de films cinématographiques
ExpiredFR728114A
(fr)
Débiteur perfectionné destiné à l'entraînement des films cinématographiques et appareil de projection perfectionné en vue de l'utilisation de ce débiteur