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发明名称
Method and apparatus for reducing the wall thickness of metal tubing
摘要
申请公布号
US3416346(A)
申请公布日期
1968.12.17
申请号
US19640366328
申请日期
1964.05.11
申请人
CALUMET & HECLA, INC.
发明人
ARRINGTON THOMAS B.
分类号
B21B3/00;B21B21/00
主分类号
B21B3/00
代理机构
代理人
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