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公开(公告)号：US2535661A
公开(公告)日：1950-12-26
申请号：US5738348
申请日：1948-10-29
Applicant: BELL TELEPHONE LABOR INC
Inventor： ADAM JR ARMAND O , AVERY ROBERT C
IPC: H04Q3/00
CPC classification number: H04Q3/0004
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