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经营范围
发明名称
Drill stem coupling
摘要
申请公布号
US2169697(A)
申请公布日期
1939.08.15
申请号
US19380203687
申请日期
1938.04.22
申请人
CHARLES KANGAS
发明人
KANGAS CHARLES
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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