United States Patent 3437289
Inventors:
Biehl, Arthur T.
Mainhardt, Robert
Publication Date:
04/08/1969
Other Classes:
60/201, 102/380
International Classes:
B21D53/00; B21K21/08; F02K9/97; F42B5/10; F42B10/30; F42B15/00; F42B33/02; B21K21/00; F02K9/00; F42B5/00; F42B10/00; F42B33/00; F42B13/24; F42B15/14