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公开(公告)号：US3444414A
公开(公告)日：1969-05-13
申请号：US3444414D
申请日：1967-01-04
Applicant: PHILIPS CORP
Inventor： BETOULE MICHEL , PETIT RENE , REBUFFIE JEAN CLAUDE
CPC classification number: H01J43/12
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