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公开(公告)号：US3225270A
公开(公告)日：1965-12-21
申请号：US27303763
申请日：1963-04-15
Applicant: PHILIPS CORP
Inventor： FREDERICK VERSTER NICO , LOURENS HAGEDOORN HENDRIK
IPC: H05H13/00
CPC classification number: H05H13/00
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