DIN 41631
DIN 41631 Rotary wafer switches 41 mm × 54 mm; 13 and 26 positions; dimensions, ratings, requirements, tests
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1982
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1982