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经营范围
发明名称
Improvements relating to derricks
摘要
申请公布号
GB1046922(A)
申请公布日期
1966.10.26
申请号
GB19640005111
申请日期
1964.02.06
申请人
THE OHIO BRASS COMPANY
发明人
分类号
E21B19/087
主分类号
E21B19/087
代理机构
代理人
主权项
地址
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