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公开(公告)号：US3160499A
公开(公告)日：1964-12-08
申请号：US12028561
申请日：1961-06-28
Applicant: PULLMAN INC
Inventor： PFEIFFER ROBERT W , GARRETT JR LUTHER W
CPC classification number: C21B13/0033 , C01G49/06 , C01G49/08 , Y02P10/136 , Y02P10/143
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