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公开(公告)号：US3344341A
公开(公告)日：1967-09-26
申请号：US33475463
申请日：1963-12-31
Applicant: BASIC PRODUCTS CORP
Inventor： BOLTON DONALD P
IPC: H01F27/38
CPC classification number: H01F27/38 , H01F2029/143
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