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发明名称
Improvements in braking mechanism for oil wells and the like
摘要
申请公布号
GB631034(A)
申请公布日期
1949.10.26
申请号
GB19470016964
申请日期
1947.06.27
申请人
MARTIN PHILLIP WINTHER
发明人
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
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