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发明名称
Rotary drilling shock absorber
摘要
申请公布号
US3257827(A)
申请公布日期
1966.06.28
申请号
US19640337836
申请日期
1964.01.15
申请人
HUGHES JAMES D
发明人
HUGHES JAMES D.
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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