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1.发明授权Method of coating the bore of a heated hollow billet with glass-like lubricating material prior to extrusion of hollow articles 失效在挤压中空制品之前，用玻璃状润滑材料涂覆加热的中空钢坯的孔的方法
公开(公告)号：US3039888A
公开(公告)日：1962-06-19
申请号：US1631160
申请日：1960-03-21
Applicant: CEFILAC
Inventor： JACQUES SEJOURNET , GEORGES LECLERC LOUIS
IPC: B21C23/32
CPC classification number: B21C23/32
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