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经营范围
发明名称
Earth penetrating apparatus
摘要
申请公布号
US2830791(A)
申请公布日期
1958.04.15
申请号
US19540409863
申请日期
1954.02.12
申请人
SMITH EDWARD W
发明人
SMITH EDWARD W.
分类号
E21B4/12;E21B7/24
主分类号
E21B4/12
代理机构
代理人
主权项
地址
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