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发明名称
Method of avoiding lapped-over seams in tubes formed in cross-roll piercing mills
摘要
申请公布号
US2780119(A)
申请公布日期
1957.02.05
申请号
US19540450855
申请日期
1954.08.19
申请人
THE NATIONAL SUPPLY COMPANY
发明人
HOLMQUIST JOHN L.
分类号
B21B19/04
主分类号
B21B19/04
代理机构
代理人
主权项
地址
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