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发明名称
Method and apparatus for forming helical lock seam pipe
摘要
申请公布号
US2282176(A)
申请公布日期
1942.05.05
申请号
US19390271308
申请日期
1939.05.02
申请人
THE AMERICAN ROLLING MILL COMPANY
发明人
FAY EUGENE;ALLSWORTH TERRENCE W.
分类号
B21C37/12
主分类号
B21C37/12
代理机构
代理人
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