DIN 15638
DIN 15638 Magnetic film 16 mm perforated along one edge; DIN-test films BF 16-320 and BF 16-514
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/1993
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/1993