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经营范围
发明名称
Well drilling apparatus
摘要
申请公布号
US3185227(A)
申请公布日期
1965.05.25
申请号
US19620177069
申请日期
1962.03.02
申请人
NORMAN A. NELSON
发明人
NELSON FRED B.
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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