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公开(公告)号：US1514898A
公开(公告)日：1924-11-11
申请号：US65241823
申请日：1923-07-18
Applicant: GEISEY GEORGE L
Inventor： GEISEY GEORGE L
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0012 , Y10T83/0505
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