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公开(公告)号：US1829783A
公开(公告)日：1931-11-03
申请号：US40560229
申请日：1929-11-08
Applicant: BELL TELEPHONE LABOR INC
Inventor： CHESNUT ROY W , FISHER HAROLD J , SANIAL ARTHUR J
IPC: H04K1/04
CPC classification number: H04K1/04
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