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公开(公告)号：US2790105A
公开(公告)日：1957-04-23
申请号：US25436451
申请日：1951-11-01
Applicant: BELL TELEPHONE LABOR INC
Inventor： HINES MARION E , RICE PHILIP J
IPC: H01J23/065 , H01J25/38
CPC classification number: H01J23/065 , H01J25/38
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