United States Patent 2735157
US Patent References:
/0240148.html
- - 0240148

/0319283.html
- - 0319283

/1018853.html
- - 1018853

Adjustable spring cushion
- - 2238774


Publication Date:
02/21/1956
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Primary Class:
27/12
Other Classes:
248/327, 5/89.100
International Classes:
A61G17/04; A61G17/00