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公开(公告)号：US3387161A
公开(公告)日：1968-06-04
申请号：US50849965
申请日：1965-11-18
Applicant: PHILIPS CORP
Inventor： LAAR JOHANNES VAN , JAN SCHEER JACOB
CPC classification number: H01J40/06 , H01J1/34 , H01J29/38 , H01J2201/3423 , Y10S148/12
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