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公开(公告)号：US1881858A
公开(公告)日：1932-10-11
申请号：US38342629
申请日：1929-08-03
Applicant: ECONOMICS LAB
Inventor： MURRAY ROBERT C
IPC: C11D15/00
CPC classification number: C11D15/00
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公开(公告)号：US1788404A
公开(公告)日：1931-01-13
申请号：US24948528
申请日：1928-01-25
Applicant: ECONOMICS LAB
Inventor： MURRAY ROBERT C
IPC: A47L15/44
CPC classification number: A47L15/4436
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