DIFF Subgroup
G03B 21/52 by prepared film
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Projectors or projection-type viewers; Accessories therefor > Details > Details specially adapted for motion-picture projection > Control devices operated by the film strip during the run > by prepared film
CPC:
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) > Control devices operated by the film strip during the run > by prepared film
No child classifications to compare. This is a leaf node in both IPC and CPC.