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公开(公告)号：US2819421A
公开(公告)日：1958-01-07
申请号：US33240653
申请日：1953-01-21
Applicant: GEN ELECTRIC
Inventor： RINGLAND ROBERT S , WATSON ROBERT P
IPC: H01J19/34
CPC classification number: H01J19/34 , H01J2893/0003
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