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发明名称
DIGGING TOOL
摘要
申请公布号
JPH03250192(A)
申请公布日期
1991.11.07
申请号
JP19900048236
申请日期
1990.02.28
申请人
MITSUBISHI MATERIALS CORP
发明人
HAYASHI TAKESHI;SATO SHIGERU;TSUJIMOTO KATSUAKI
分类号
E21B10/32;E21B4/06;E21B6/00;E21B6/02;E21B10/38
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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