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公开(公告)号：US2968174A
公开(公告)日：1961-01-17
申请号：US69428057
申请日：1957-11-04
Applicant: HOOVER CO
Inventor： CHARLTON BELL WILLIAM , GEORGE DUNN HAROLD , HARROW WEALD , KERSHAW HAYDON EDWARD , WILLIAM PLINT DENNIS JOHN , RALPH SEARLE WALTER WILLIAM
IPC: D06F23/02
CPC classification number: D06F23/02
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