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发明名称
Tool joint for well drilling
摘要
申请公布号
US2205697(A)
申请公布日期
1940.06.25
申请号
US19380206408
申请日期
1938.05.06
申请人
SCHARPENBERG CHARLES C
发明人
SCHARPENBERG CHARLES C.
分类号
E21B17/042
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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