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公开(公告)号：US1998884A
公开(公告)日：1935-04-23
申请号：US51493131
申请日：1931-02-11
Applicant: BELL TELEPHONE LABOR INC
Inventor： ROCKWOOD JR GEORGE H , LODGE WILLIAM B
IPC: H01J17/04
CPC classification number: H01J17/04
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