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经营范围
发明名称
Pulldown device for well drills
摘要
申请公布号
US2693344(A)
申请公布日期
1954.11.02
申请号
US19480049029
申请日期
1948.09.13
申请人
HUGHES TOOL COMPANY
发明人
SCOTT FLOYD L.
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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