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1.发明授权
公开(公告)号：US3372357A
公开(公告)日：1968-03-05
申请号：US52938566
申请日：1966-02-23
Applicant: BAYER AG
Inventor： KARL DIETZEL , ULRICH VEIEL
IPC: H01F7/20
CPC classification number: H01F7/206
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