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经营范围
发明名称
PIPE
摘要
申请公布号
US3578029(A)
申请公布日期
1971.05.11
申请号
USD3578029
申请日期
1969.06.27
申请人
YOUNGSTOWN SHEET AND TUBE CO.
发明人
ROY H. CULLEN;CHARLES H. ELLIOTT;JIMMIE R. AKER;HARVEY O. MOHR
分类号
E21B17/20;F16L11/12;(IPC1-7):F16L11/16
主分类号
E21B17/20
代理机构
代理人
主权项
地址
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