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公开(公告)号：US3002731A
公开(公告)日：1961-10-03
申请号：US62230556
申请日：1956-11-15
Applicant: GEN MOTORS CORP
Inventor： LOUIS GELFAND , FRED SMITH ROBERT
CPC classification number: A47L15/13 , A47L2601/17 , B08B3/123
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