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公开(公告)号：US2273688A
公开(公告)日：1942-02-17
申请号：US29840839
申请日：1939-10-07
Applicant: BELL TELEPHONE LABOR INC
Inventor： BOLZ ANDREW L , BREDEHOFT HAROLD A , WIEBUSCH CHARLES F
IPC: G10K1/062
CPC classification number: G10K1/062
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