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发明名称
AUTOMATIC FALL CONTROLLER FOR EXCAVATING DEVICE OF VERTICAL HOLE EXCAVATOR
摘要
申请公布号
JPS57112590(A)
申请公布日期
1982.07.13
申请号
JP19800185003
申请日期
1980.12.27
申请人
HITACHI KENKI KK
发明人
KUSUMI HIROSHI
分类号
E21B44/00;E21B44/04
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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