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公开(公告)号：US3121775A
公开(公告)日：1964-02-18
申请号：US86160859
申请日：1959-12-23
Applicant: BELL TELEPHONE LABOR INC
Inventor： AMORY ROBERT W , LOWRY TERRELL N
IPC: H04M3/30
CPC classification number: H04M3/30
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