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发明名称
WELL BORING
摘要
申请公布号
JPH04309685(A)
申请公布日期
1992.11.02
申请号
JP19910103061
申请日期
1991.04.08
申请人
MITSUBISHI MATERIALS CORP;KAGOTA BORING:KK
发明人
HIWASA YONEO;KAGOTA NORIO
分类号
E21B7/20;E21B10/32;E21B43/00
主分类号
E21B7/20
代理机构
代理人
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地址
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