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经营范围
发明名称
Earth boring apparatus
摘要
申请公布号
US2828944(A)
申请公布日期
1958.04.01
申请号
US19540417157
申请日期
1954.03.18
申请人
BORG-WARNER CORPORATION
发明人
UDRY JOHN J.
分类号
E21B4/06
主分类号
E21B4/06
代理机构
代理人
主权项
地址
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