Roller board device
United States Patent 2764411
US Patent References:
/0218588.html
- - 0218588

Shock absorber
- - 1423946

Exercising device
- - 1824920

Exercising device
- - 2253996

Transfer system
- - 2473863


Inventors:
Washburn Jr., Stanley
Publication Date:
09/25/1956
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Assignee:
Washburn Jr., Stanley
Primary Class:
482/146
Other Classes:
280/3, 280/1
International Classes:
A63B22/16; A63B22/00