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公开(公告)号：US2067520A
公开(公告)日：1937-01-12
申请号：US1665135
申请日：1935-04-16
Applicant: BELL TELEPHONE LABOR INC
Inventor： CURTIS AUSTEN M , WOOD IRA E
IPC: G01R13/04
CPC classification number: G01R13/04
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