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公开(公告)号：US2954433A
公开(公告)日：1960-09-27
申请号：US69345257
申请日：1957-10-30
Applicant: BELL TELEPHONE LABOR INC
Inventor： LEWIS WILLARD D , ROSE ALAN C
CPC classification number: H04L1/0057 , H03M13/17
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