DIN 3993-4
DIN 3993-4
Geometrical design of cylindrical internal involute gear pairs; Diagrams for limits of internal gear - pinion type cutter matingsstandard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1981
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1981