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公开(公告)号：US1612438A
公开(公告)日：1926-12-28
申请号：US65448223
申请日：1923-07-28
Applicant: PHILIPS NV
Inventor： GILLES HOLST , OTTO JULIUS WILLEM , EKKO OOSTERHUIS
IPC: H02M7/06
CPC classification number: H02M7/06
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