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公开(公告)号：US1973360A
公开(公告)日：1934-09-11
申请号：US50164330
申请日：1930-12-11
Applicant: PHILIPS NV
Inventor： WILLEM SIX , WILLEM METZELAAR
IPC: G11B7/00
CPC classification number: G11B7/00
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