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公开(公告)号：US2642498A
公开(公告)日：1953-06-16
申请号：US17826250
申请日：1950-08-08
Applicant: BELL TELEPHONE LABOR INC
Inventor： GEORGE RIDDELL , SOUCY HAROLD A
IPC: H04Q3/00
CPC classification number: H04Q3/00
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