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公开(公告)号：US1870387A
公开(公告)日：1932-08-09
申请号：US50504330
申请日：1930-12-27
Applicant: DORR CO INC
Inventor： SHIMMIN JOHN T
IPC: B01D33/00
CPC classification number: B01D33/11 , B01D2201/282
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