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公开(公告)号：US2986723A
公开(公告)日：1961-05-30
申请号：US1126960
申请日：1960-02-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： DARWIN GEORGE P , PRIM ROBERT C
CPC classification number: H04J3/0679 , H04J3/0641
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