CPC Subgroup
G03B 21/32 Details specially adapted for motion-picture projection (with film moving continuously through the gate G03B41/02)
Full Title
Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00) > Details > Details specially adapted for motion-picture projection (with film moving continuously through the gate G03B41/02)
7 direct subcodes
Child Classifications
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- G03B 21/34 Change-over arrangements
- G03B 21/38 Prolonged exhibition of single frame
- G03B 21/40 Eliminating or reducing effect of flicker
- G03B 21/42 Preventing damage to film due to abnormal operation of projector
- G03B 21/43 Driving mechanisms
- G03B 21/50 Control devices operated by the film strip during the run