Description
Class 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
Subclass 1/10: Film-strip handling of general interest for cameras, projectors or printers Moving film strip by pull on end thereof Pull exerted by take-up spool rotated by knob through gearing