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公开(公告)号：US3409877A
公开(公告)日：1968-11-05
申请号：US41436564
申请日：1964-11-27
Applicant: BELL TELEPHONE LABOR INC
Inventor： ALTERMAN MICHAEL E , HUFFMAN DONALD W , FRANK S VIGLIANTE
IPC: H04Q11/04
CPC classification number: H04Q11/0407
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