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公开(公告)号：US2764800A
公开(公告)日：1956-10-02
申请号：US49378155
申请日：1955-03-11
Applicant: GEN ELECTRIC CANADA
Inventor： DOUGLAS HARWOOD
IPC: H01J9/46
CPC classification number: H01J9/46 , H01J2893/0096 , H01J2893/0097
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