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公开(公告)号：US2846507A
公开(公告)日：1958-08-05
申请号：US43412554
申请日：1954-06-03
Applicant: BELL TELEPHONE LABOR INC
Inventor： SANDALLS AGNES R , VIBBARD EDWARD L , WICHMAN WESLEY T
IPC: H04M17/02
CPC classification number: H04M17/023
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