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发明名称
CASING BIT
摘要
申请公布号
JPH0533572(A)
申请公布日期
1993.02.09
申请号
JP19910211564
申请日期
1991.07.29
申请人
TOSHIBA TUNGALOY CO LTD
发明人
YAMAMOTO KAZU
分类号
E21B10/02;E21B10/48;E21B10/56
主分类号
E21B10/02
代理机构
代理人
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地址
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