Roller board device
United States Patent 2829891
US Patent References:
/0459282.html
- - 0459282

Polio exercising machine
- - 2456017


Inventors:
George, Ludwig Frederic
Publication Date:
04/08/1958
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Assignee:
George, Ludwig Frederic
Primary Class:
482/146
International Classes:
A63B22/16; A63G11/00; A63B22/00
Foreign References:
DE197253C
FR1098795A