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公开(公告)号：US2892508A
公开(公告)日：1959-06-30
申请号：US65347157
申请日：1957-04-17
Applicant: BELL TELEPHONE LABOR INC
Inventor： KOHMAN GIRARD T , MASON WARREN P , MCAFEE JR KENNETH B
IPC: B01D53/22
CPC classification number: B01D53/22 , B01D63/087
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