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发明名称
AUTOMATIC CASING PIPE BURYING APPARATUS FOR HARD ROCK DRILL
摘要
申请公布号
JPS56167089(A)
申请公布日期
1981.12.22
申请号
JP19800068823
申请日期
1980.05.26
申请人
HITACHI CONSTRUCTION MACHINERY
发明人
SAITOU TAKEO
分类号
E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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