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公开(公告)号：US2223470A
公开(公告)日：1940-12-03
申请号：US17486037
申请日：1937-11-16
Applicant: GEN ELECTRIC
Inventor： ALPHEN PIETER M VAN , DORGELO EDUARD G , LEMMENS HENDRICUS J
IPC: H01J61/82
CPC classification number: H01J61/822
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