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1.发明授权
公开(公告)号：US3419386A
公开(公告)日：1968-12-31
申请号：US62200167
申请日：1967-03-09
Applicant: UNION CARBIDE CORP
Inventor： HOLLAND HARRY W , HELVEY WALTER F
CPC classification number: H01G9/0525 , C22C1/04 , C22C1/045
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