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
Assignee:
BABCOCK & WILCOX CO
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:
| 2441143 | Broach | | | |
| 2463997 | Method of making integral external and internal finned tubing | | | |
| 2779222 | Apparatus for making heat exchange tubes | | | |
| 2872720 | Rifling device | | | |