FR689923A - Perfectionnements apportés aux dispositifs employés pour le refroidis sement du faisceau lumineux dans les projections cinématographiques
- Google Patents
Perfectionnements apportés aux dispositifs employés pour le refroidis sement du faisceau lumineux dans les projections cinématographiques
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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
G03B21/16—Cooling; Preventing overheating
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FR689923D1929-04-251929-04-25Perfectionnements apportés aux dispositifs employés pour le refroidis sement du faisceau lumineux dans les projections cinématographiques
ExpiredFR689923A
(fr)