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发明名称
Fluid-operated spudding mechanism
摘要
申请公布号
US2863637(A)
申请公布日期
1958.12.09
申请号
US19560574410
申请日期
1956.03.28
申请人
BUCYRUS-ERIE COMPANY
发明人
THORNBURG HERBERT W.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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