Wenderoth, Lind & Ponack
Method of and apparatus for forming long metal tubing stock to tapered shape
 The method and apparatus permit a relatively long metal tubing stock to be finished to any desired tapered shape through a single-pass operation. The apparatus is provided in the form of a tandem configuration including any number of individual swaging units each having the identical construction including the same working parts and assemblies. The grooved roll arrangement associated with the tandem-configured swaging units is used as a preliminary step, and forms an initial metal tubing stock to a multiple-stepped shape. 
B B Y
B21C B21J Y10S
inventional inventional additional
Keiichiro
Yoshida