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公开(公告)号：US2909285A
公开(公告)日：1959-10-20
申请号：US57481056
申请日：1956-03-29
Applicant: BESLER FREDERICK C
Inventor： BESLER FREDERICK C
CPC classification number: B01D29/39 , B01D29/94 , B01D29/96 , B01D2201/265
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