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公开(公告)号：US3166825A
公开(公告)日：1965-01-26
申请号：US27115663
申请日：1963-04-08
Applicant: PHILIPS CORP
Inventor： CORNELUS TAZELAAR WILLEM , REINDER WESTRA
CPC classification number: B23Q7/04 , H01J9/46 , H01J2893/0096
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