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公开(公告)号：US2234921A
公开(公告)日：1941-03-11
申请号：US22979338
申请日：1938-09-13
Applicant: WILLIAM D RAMAGE , ROBERT M MCMANIGAL
Inventor： ALAN WEBB WELLS
CPC classification number: C10G19/00 , B01D11/0461 , B01F9/10 , B04B5/00 , B04B5/06 , Y10S494/901
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