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公开(公告)号：US3379945A
公开(公告)日：1968-04-23
申请号：US40827564
申请日：1964-11-02
Applicant: HOOVER CO
Inventor： HENRY MITCHELL JOHN , RALPH SEARLE WALTER WILLIAM
CPC classification number: H02P5/74 , D06F37/304 , H02K16/00 , H02P5/747
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