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发明名称
ROCK BIT
摘要
申请公布号
JPH07324580(A)
申请公布日期
1995.12.12
申请号
JP19940139414
申请日期
1994.05.30
申请人
TOSHIBA TUNGALOY CO LTD
发明人
ITO KATSUHIRO
分类号
E21B10/36;E21B10/46;(IPC1-7):E21B10/46
主分类号
E21B10/36
代理机构
代理人
主权项
地址
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