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公开(公告)号：US2957097A
公开(公告)日：1960-10-18
申请号：US71056158
申请日：1958-01-22
Applicant: PHILIPS CORP
Inventor： PIETER SCHAGEN , ALBERT EASTWELL BERNARD , RITCHIE CALDER NIGEL DAVID
IPC: H01J31/10
CPC classification number: H01J31/10
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