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经营范围
发明名称
DRILL PIPE
摘要
申请公布号
GB8703519(D0)
申请公布日期
1987.03.25
申请号
GB19870003519
申请日期
1987.02.16
申请人
GEWERKSCHAFT EISENHUTTE WESTFALIA GMBH
发明人
分类号
E21B7/20;E21B17/02;E21B17/18
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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