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发明名称
Method of and apparatus for forming spiral pipes
摘要
申请公布号
US2059578(A)
申请公布日期
1936.11.03
申请号
US19320601622
申请日期
1932.03.28
申请人
HENNING BRUNO W
发明人
HENNING BRUNO W.
分类号
B21C37/12
主分类号
B21C37/12
代理机构
代理人
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地址
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