Details

Full Title

Projectors or projection-type viewers; Accessories therefor > Details

Classification Context

Section:

PHYSICS

Class:

PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY

Subclass:

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

Child Classifications

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• G03B 21/16 Cooling; Preventing overheating
• G03B 21/18 Fire preventing or extinguishing
• G03B 21/2 Lamp housings
• G03B 21/22 Soundproof bodies
• G03B 21/26 Projecting separately subsidiary matter simultaneously with main image
• G03B 21/28 Reflectors in projection beam
• G03B 21/3 adapted to collapse or fold, e.g. for portability
• G03B 21/32 Details specially adapted for motion-picture projection
• G03B 21/53 Means for automatic focusing, e.g. to compensate thermal effects