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公开(公告)号：US3299404A
公开(公告)日：1967-01-17
申请号：US24804462
申请日：1962-12-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： YAMARONE RONALD E , ZYDNEY HERBERT M
IPC: H04Q1/45
CPC classification number: H04Q1/45
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