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公开(公告)号：US2575804A
公开(公告)日：1951-11-20
申请号：US78985047
申请日：1947-12-05
Applicant: BELL TELEPHONE LABOR INC
Inventor： FRLIS HARALD T , LEWIS WILLARD D , TILLOTSON LE ROY C
IPC: H01P5/20
CPC classification number: H01P5/20
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