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发明名称
Improvements in and relating to control heads for wells
摘要
申请公布号
GB364135(A)
申请公布日期
1931.12.30
申请号
GB19300023016
申请日期
1930.07.30
申请人
THE NATIONAL SUPPLY COMPANY
发明人
分类号
E21B33/04
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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