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G03B21/321
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Parent Industries
G
PHYSICS
G03
Photography
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
Current Industry
G03B21/321
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