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公开(公告)号：US2813374A
公开(公告)日：1957-11-19
申请号：US34034853
申请日：1953-03-04
Applicant: WESTERN ELECTRIC CO
Inventor： BOUWMAN BERT J , GELLATLY JOHN S
IPC: H01J5/26
CPC classification number: H01J5/26 , H01J2893/0041
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