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公开(公告)号：US2998522A
公开(公告)日：1961-08-29
申请号：US67933357
申请日：1957-08-21
Applicant: GEN DYNAMICS CORP
Inventor： MARTIN TROY C , GREEN OTTIS E
IPC: H01J47/06
CPC classification number: H01J47/06
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