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公开(公告)号：US2269022A
公开(公告)日：1942-01-06
申请号：US35571240
申请日：1940-09-07
Applicant: BELL TELEPHONE LABOR INC
Inventor： GEORGE HCCHT , LUNDSTROM ALEXIS A
IPC: H04Q1/453
CPC classification number: H04Q1/453
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