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公开(公告)号：US2457891A
公开(公告)日：1949-01-04
申请号：US57250645
申请日：1945-01-12
Applicant: ANDREW F HENNINGER , GEORGE D HENNINGER
Inventor： HENNINGER ANDREW F , HENNINGER GEORGE D , REITHERMAN RALPH W
IPC: H01J17/44
CPC classification number: H01J17/44 , H01J2893/0068
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