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发明名称
EARTH BORING BIT WITH IMPROVED RIGID FACE SEAL ASSEMBLY
摘要
申请公布号
EP0202190(B1)
申请公布日期
1992.08.19
申请号
EP19860630088
申请日期
1986.05.06
申请人
HUGHES TOOL COMPANY
发明人
BURR, BRUCE HAWLEY
分类号
F16J15/34;E21B10/24;E21B10/22;E21B10/25
主分类号
F16J15/34
代理机构
代理人
主权项
地址
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