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公开(公告)号：US2859282A
公开(公告)日：1958-11-04
申请号：US61706056
申请日：1956-10-19
Applicant: BELL TELEPHONE LABOR INC
Inventor： DUNLAP KERMIT S , TAYLOR JEREMY P
IPC: H04Q3/52
CPC classification number: H04Q3/525
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