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公开(公告)号：US2740068A
公开(公告)日：1956-03-27
申请号：US26373651
申请日：1951-12-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： ROBERTSON GEORGE H , WALSH EDWARD J
IPC: H01J23/30
CPC classification number: H01J23/30
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