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公开(公告)号：US2250228A
公开(公告)日：1941-07-22
申请号：US29813839
申请日：1939-10-05
Applicant: GEN ELECTRIC
Inventor： LEEDS REGINALD E , MARCELLO PIRANI
IPC: H01K3/22
CPC classification number: H01K3/22
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