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公开(公告)号:US2326346A
公开(公告)日:1943-08-10
申请号:US36401940
申请日:1940-11-02
Applicant: GEN ELECTRIC
Inventor: FOOTE ALTON G
IPC: H01J61/28 , H01J61/70
CPC classification number: H01J61/28 , H01J61/70