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公开(公告)号：US2973236A
公开(公告)日：1961-02-28
申请号：US75560558
申请日：1958-08-18
Applicant: GEN MOTORS CORP
Inventor： HICKS ROBERT B , GRAHN EDWIN O
CPC classification number: F25D23/04 , F25D25/027
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