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公开(公告)号：US2991487A
公开(公告)日：1961-07-11
申请号：US76846758
申请日：1958-10-20
Applicant: CAL DAK COMPANY
Inventor： GEORGE BECKWELL
IPC: A47C21/08
CPC classification number: A61G7/0507 , A47C21/08 , A61G7/0518
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公开(公告)号：US2859454A
公开(公告)日：1958-11-11
申请号：US64135057
申请日：1957-02-20
Applicant: CAL DAK COMPANY
Inventor： GEORGE BECKWELL
IPC: A47C21/08
CPC classification number: A61G7/0507 , A47C21/08 , A61G7/0518
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