Frictional resistance device
United States Patent 1868262

Inventors:
Staley, Joseph H.
Publication Date:
07/19/1932
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Assignee:
Staley, Joseph H.
Primary Class:
482/116
Other Classes:
482/72
International Classes:
A63B21/015; A63B21/068; A63B21/012; A63B21/06