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公开(公告)号：US3018504A
公开(公告)日：1962-01-30
申请号：US652660
申请日：1960-02-03
Applicant: REGINA CORP
Inventor： HART WILLIAM D
IPC: A47L11/20
CPC classification number: A47L11/4008 , A47L11/201 , A47L11/4036 , A47L11/4044 , A47L11/4075 , A47L11/408 , A47L11/4088
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