Title:
Piercing point
United States Patent 1950938

Inventors:
Dunn, John J.
Wright, Edwin C.
Publication Date:
03/13/1934
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Assignee:
NAT TUBE CO
Primary Class:
72/463
Other Classes:
72/478, 72/97, 72/479, 72/482.940
International Classes:
B21B25/00