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公开(公告)号：US3140419A
公开(公告)日：1964-07-07
申请号：US11281561
申请日：1961-05-26
Applicant: NORTH AMERICAN PHILLIPS COMPAN
Inventor： DER POEL JAN VAN
IPC: H01J19/28
CPC classification number: H01J19/28 , H01J2893/0013
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