Method of forming an internal rib in the bore of a tube
United States Patent 3213525

Inventors:
Creighton, William M.
Evans, Sidley O.
Mcmurdy, Addison E.
Publication Date:
10/26/1965
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Assignee:
BABCOCK & WILCOX CO
Primary Class:
Other Classes:
409/306, 409/293, 29/890.050, 72/95, 29/890.051, 29/557
International Classes:
B21C37/20; B23C3/32; B23D43/00; B23G1/22; B21C37/15; B23C3/00; B23G1/00
US Patent References:
2441143Broach
2463997Method of making integral external and internal finned tubing
2779222Apparatus for making heat exchange tubes
2872720Rifling device
Foreign References:
AU111528B