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经营范围
发明名称
Rock drill joint
摘要
申请公布号
US2107238(A)
申请公布日期
1938.02.01
申请号
US19370153234
申请日期
1937.07.12
申请人
DES ROCHES HILTON H
发明人
ROCHES HILTON H. DES
分类号
E21B17/046
主分类号
E21B17/046
代理机构
代理人
主权项
地址
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