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公开(公告)号：US2270788A
公开(公告)日：1942-01-20
申请号：US32728240
申请日：1940-04-01
Applicant: GEN ELECTRIC
Inventor： SCOTT WILLIAM J , DAVIES LEONARD J , THOMAS COWHIG WILLIAM
IPC: H01J9/395
CPC classification number: H01J9/395
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