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公开(公告)号：US891998A
公开(公告)日：1908-06-30
申请号：US1907372264
申请日：1907-05-06
Applicant: PITTSBURGH FILTER MFG COMPANY
Inventor： KNIGHT GERALD W
CPC classification number: B01D24/4636 , B01D24/22 , B01D2201/087
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