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经营范围
发明名称
Telescoping Drill Pipe.
摘要
申请公布号
GB1180895(A)
申请公布日期
1970.02.11
申请号
GB19680029985
申请日期
1968.06.24
申请人
GARDNER-DENVER COMPANY
发明人
分类号
E21B7/02;E21B17/07
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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