DIN 108-55
DIN 108-55 Slide projectors and slides; straight cartridge 5 × 5-36 and 5 × 5-50; certification scheme
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/1991
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/1991