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经营范围
发明名称
Horizontal earth boring machine
摘要
申请公布号
US2647726(A)
申请公布日期
1953.08.04
申请号
US19500171469
申请日期
1950.06.30
申请人
THE HALLEN COMPANY, INC.
发明人
KIRK MELVIN B.
分类号
E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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