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公开(公告)号：US3068322A
公开(公告)日：1962-12-11
申请号：US81643759
申请日：1959-05-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： FEDER HERBERT S , MANASSE FRED K
IPC: H04J3/20
CPC classification number: H04J3/20
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