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经营范围
发明名称
Percussion drill bit
摘要
申请公布号
US3382940(A)
申请公布日期
1968.05.14
申请号
US19650499382
申请日期
1965.10.21
申请人
FRANK E. STEBLEY
发明人
STEBLEY FRANK E.
分类号
E21B10/40;E21B10/56;E21B10/62
主分类号
E21B10/40
代理机构
代理人
主权项
地址
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