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发明名称
Method of producing duplex internally finned tube unit
摘要
申请公布号
US3267564(A)
申请公布日期
1966.08.23
申请号
US19640362029
申请日期
1964.04.23
申请人
CALUMET & HECLA, INC.
发明人
KEYES JOHN M.
分类号
B21C1/22;B21C23/10;B21C23/22;B21C37/15;B21C37/20;B21D53/06;B23K20/00;F28F1/40;F28F13/18;F28F19/06;F28F21/08
主分类号
B21C1/22
代理机构
代理人
主权项
地址
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