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发明名称
ROLLER DRILL BITS
摘要
申请公布号
GB2138864(B)
申请公布日期
1986.07.30
申请号
GB19830011595
申请日期
1983.04.28
申请人
* SUMITOMO METAL MINING COMPANY LIMITED
发明人
SHO * TAKANO
分类号
E21B10/52;E21B10/56;E21B10/567;(IPC1-7):E21B10/16
主分类号
E21B10/52
代理机构
代理人
主权项
地址
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