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公开(公告)号：US2030450A
公开(公告)日：1936-02-11
申请号：US3705835
申请日：1935-08-20
Applicant: GEN ELECTRIC
Inventor： ARTUR HAUCKE , HERMANN KREFFT
IPC: H01J17/04
CPC classification number: H01J17/04
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