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发明名称
DRILLING BIT
摘要
申请公布号
JPH0893377(A)
申请公布日期
1996.04.09
申请号
JP19940229412
申请日期
1994.09.26
申请人
MITSUBISHI MATERIALS CORP
发明人
HAYASHI TAKESHI;TAKAGI KAZUHIRO
分类号
E21B10/58;E21C35/18;E21C35/183;(IPC1-7):E21C35/183
主分类号
E21B10/58
代理机构
代理人
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