United States Patent 1714043
Inventors:
Otto, Pabst
Seibert, Carl F.
Publication Date:
05/21/1929
Assignee:
NILES BEMENT POND CO
Other Classes:
60/417, 60/484, 91/4R, 91/32, 91/358R, 91/519, 92/165R, 100/269.15, 100/269.16
International Classes:
B21K25/00