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经营范围
发明名称
Hydraulic drilling jar
摘要
申请公布号
US5033557(A)
申请公布日期
1991.07.23
申请号
US19900519627
申请日期
1990.05.07
申请人
ANADRILL, INC.
发明人
ASKEW, WARREN E.
分类号
E21B29/00;E21B31/113;G05D7/01
主分类号
E21B29/00
代理机构
代理人
主权项
地址
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