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公开(公告)号：US2056034A
公开(公告)日：1936-09-29
申请号：US49048430
申请日：1930-10-22
Applicant: GEN ELECTRIC
Inventor： BRUCKER GEORGE W
IPC: H01J13/20
CPC classification number: H01J13/20 , H01J2893/0092
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