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公开(公告)号：US2827606A
公开(公告)日：1958-03-18
申请号：US61774056
申请日：1956-10-23
Applicant: GEN ELECTRIC
Inventor： KELLEY JR FRED W , SIEGEL CLIFFORD M
CPC classification number: H02P7/30 , G05B11/016 , H03F9/04 , Y10T307/414
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