Exercising machines operable independently of the exercising person's applied force
United States Patent 3372928
US Patent References:
/0928085.html
- - 0928085

Retractable goal posts
- - 2884252

Exercising machine
- - 2969060

Exercising apparatus
- - 3045667

/3128904.html
- - 3128904


Inventors:
Robert, Showalter Merle
Publication Date:
03/12/1968
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Primary Class:
482/7
Other Classes:
482/903
International Classes:
A63B21/002; A63B21/00; A63B21/005
Foreign References:
IT302572B