United States Patent 3148389
Publication Date:
09/15/1964
Assignee:
PUROFIED DOWN PRODUCTS CORP
International Classes:
A47C27/15; A47C27/20; A47G9/10; A47C27/14; A47G9/00
US Patent References:
| 3089154 | Mattress construction having different degrees of firmness | | | |