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发明名称
Making spiral welded pipe
摘要
申请公布号
US1774000(A)
申请公布日期
1930.08.26
申请号
US19270226879
申请日期
1927.10.18
申请人
CALIFORNIA CORRUGATED CULVERT COMPANY
发明人
HAND AUGUSTIN J.
分类号
B21C37/12
主分类号
B21C37/12
代理机构
代理人
主权项
地址
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