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公开(公告)号：US2969476A
公开(公告)日：1961-01-24
申请号：US68492357
申请日：1957-09-19
Applicant: MILES PENNYBACKER
Inventor： MILES PENNYBACKER , SIMPSON CHARLES A
IPC: H01J61/72
CPC classification number: H01J61/72
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