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公开(公告)号：US1987998A
公开(公告)日：1935-01-15
申请号：US62661932
申请日：1932-07-30
Applicant: ELECTRONS INC OF DELAWARE
Inventor： EDWARDS DONALD V , SMITH EARL K
IPC: H01J17/36
CPC classification number: H01J17/36
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