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公开(公告)号：US2683255A
公开(公告)日：1954-07-06
申请号：US16231250
申请日：1950-05-16
Applicant: BELL TELEPHONE LABOR INC
Inventor： KOOS PAUL V , OBERLE LOUIS A
IPC: H01P1/22
CPC classification number: H01P1/222
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