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公开(公告)号：US2796538A
公开(公告)日：1957-06-18
申请号：US45749254
申请日：1954-09-21
Applicant: MANDREL INDUSTRIES
Inventor： HOOVER MICHAEL C , VANDER MEER CLAYTON H
IPC: H03K17/288
CPC classification number: H03K17/288 , Y10T307/878
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