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公开(公告)号：US2933191A
公开(公告)日：1960-04-19
申请号：US74166458
申请日：1958-06-12
Applicant: FRAM CORP
Inventor： ROHR FRANK G
IPC: B01D17/04
CPC classification number: B01D17/045 , Y10S210/05
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