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公开(公告)号：US2047944A
公开(公告)日：1936-07-21
申请号：US1811535
申请日：1935-04-25
Applicant: HYGRADE SYLVANIA CORP
Inventor： ACKMAN HOWARD E , FINLEY CARTER EMMETT
IPC: H01J1/18
CPC classification number: H01J1/18
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