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经营范围
发明名称
Well drilling rig attachment
摘要
申请公布号
US2079449(A)
申请公布日期
1937.05.04
申请号
US19360071472
申请日期
1936.03.28
申请人
RALPH E. GILCHRIST
发明人
HALDEMAN ALBERT A.
分类号
E21B7/06
主分类号
E21B7/06
代理机构
代理人
主权项
地址
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