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发明名称
Flexible joint for drill string
摘要
申请公布号
US3135103(A)
申请公布日期
1964.06.02
申请号
US19620190733
申请日期
1962.04.27
申请人
HAROLD BLACK
发明人
BLACK HAROLD
分类号
E21B17/07
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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