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发明名称
DRILL BIT WEAR RESISTANT SURFACE FOR ELASTOMERIC SEAL
摘要
申请公布号
GB2232430(A)
申请公布日期
1990.12.12
申请号
GB19900013383
申请日期
1990.06.15
申请人
* DRESSER INDUSTRIES INC
发明人
JAMES W. * LANGFORD,JR.
分类号
E21B10/22;E21B10/25;F16J15/32
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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