DIN 1912-4
DIN 1912-4
Graphical Representation of Welded, Soldered and Brazed Joints; Concepts and Terms for Soldered and Brazed Joints and Seamsstandard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/1981
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/1981