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1.发明授权
公开(公告)号：US2787839A
公开(公告)日：1957-04-09
申请号：US22584151
申请日：1951-05-11
Applicant: TAYLOR EDWARD E
Inventor： TAYLOR EDWARD E
IPC: H01J21/08
CPC classification number: H01J21/08
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