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发明名称
IMPROVED SEAL AND BEARING APPARATUS FOR BITS
摘要
申请公布号
EP0240234(A3)
申请公布日期
1988.10.05
申请号
EP19870302582
申请日期
1987.03.25
申请人
DRESSER INDUSTRIES, INC.
发明人
IPPOLITO, RODOLFO M.
分类号
E21B10/22;E21B10/25;F16J15/34;(IPC1-7):E21B10/22;F16C33/26;F16C33/72
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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