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公开(公告)号：US3387873A
公开(公告)日：1968-06-11
申请号：US62681967
申请日：1967-03-29
Applicant: HOOVER CO
Inventor： STUART PROSSER ERIC , GRAYHAM HALL WILLIAM
CPC classification number: D06F37/42 , A47L15/4259 , Y10T70/5602 , Y10T292/0997
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