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公开(公告)号：US2298904A
公开(公告)日：1942-10-13
申请号：US35925440
申请日：1940-10-01
Applicant: GEN ELECTRIC
Inventor： SCOTT WILLIAM J , DAVIES LOONARD J
IPC: H01J61/54
CPC classification number: H01J61/542
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