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公开(公告)号：US2253577A
公开(公告)日：1941-08-26
申请号：US26650639
申请日：1939-04-07
Applicant: BELL TELEPHONE LABOR INC
Inventor： PEARSON GERALD L , STUCKY JR JOSEPH B
IPC: H01C7/04
CPC classification number: H01C7/04 , Y10T29/49098
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