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公开(公告)号：US1932070A
公开(公告)日：1933-10-24
申请号：US51902531
申请日：1931-02-28
Applicant: ECONOMICS LAB
Inventor： GRANT ULYSSES S , LANE THOMAS D
IPC: A47L15/44
CPC classification number: A47L15/4436
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公开(公告)号：US1940217A
公开(公告)日：1933-12-19
申请号：US57371331
申请日：1931-11-07
Applicant: ECONOMICS LAB
Inventor： LANE THOMAS D
IPC: A47L15/44
CPC classification number: A47L15/4436
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