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发明名称
Coupling for drill rods
摘要
申请公布号
US1762057(A)
申请公布日期
1930.06.03
申请号
US19290374698
申请日期
1929.06.29
申请人
GATES GEORGE C;CLARK REX W;WILLS PRESLAY C
发明人
GATES GEORGE C.;CLARK REX W.;WILLS PRESLAY C.
分类号
E21B17/043
主分类号
E21B17/043
代理机构
代理人
主权项
地址
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