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公开(公告)号：US2836370A
公开(公告)日：1958-05-27
申请号：US62960856
申请日：1956-12-20
Applicant: SYLVANIA ELECTRIC PROD
Inventor： DREES JOSEPH M , JONES KENNETH L
CPC classification number: B65H54/28 , H01F41/073
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