Mattress
United States Patent 2504352
US Patent References:
/0742521.html
- - 0742521

/1153644.html
- - 1153644

Mattress
- - 1351166

Mattress
- - 1980445

Proportional resistance spring structure
- - 2137298


Inventors:
Robell, Paul R.
Publication Date:
04/18/1950
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Assignee:
Robell, Paul R.
Primary Class:
5/716
Other Classes:
5/727
International Classes:
A47C27/00; A47C27/06; A47C27/04
US Patent References:
2192463Inner-spring unit for mattresses
2192601Rubber mattress
Foreign References:
DE449463C