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公开(公告)号：US3140357A
公开(公告)日：1964-07-07
申请号：US20598962
申请日：1962-06-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： WERNER BISCHOF , DOKTOR THEODORE L , ZENON LEGEDZA
IPC: H04Q1/453
CPC classification number: H04Q1/453
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