Swivel
United States Patent 2429929
US Patent References:
/1280536.html
- - 1280536

Swivel
- - 1522226

Swivel
- - 1701898

Swivel
- - 2346380

Rotary swivel
- - 2195501


Inventors:
Fisher, Robert P.
Publication Date:
10/28/1947
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Assignee:
Fisher, Robert P.
Primary Class:
285/281
Other Classes:
285/332.400, 285/61, 403/164, 285/276, 59/95
International Classes:
E21B21/02; E21B21/00