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发明名称
DRILL STRING SHOCK ABSORBER
摘要
申请公布号
GB2015060(A)
申请公布日期
1979.09.05
申请号
GB19790002885
申请日期
1979.01.26
申请人
CHRISTENSEN INC
发明人
分类号
E21B17/07;F16D3/06;(IPC1-7):E21B17/00
主分类号
E21B17/07
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代理人
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