Title:
Method of making boiler tubing
United States Patent 1540270


Inventors:
George, May
Application Number:
US69239024A
Publication Date:
06/02/1925
Filing Date:
02/12/1924
Assignee:
Emily, Schmidt
Primary Class:
Other Classes:
29/890.053
International Classes:
B21C37/08; B21C37/15
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