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发明名称
AUTOMATIC CONTROLLER FOR DESCENT OF EXCAVATING TOOL OF EXCAVATOR
摘要
申请公布号
JPS55136393(A)
申请公布日期
1980.10.24
申请号
JP19790043042
申请日期
1979.04.11
申请人
HITACHI CONSTRUCTION MACHINERY
发明人
IKEDA AKINORI
分类号
E21B44/00;E21B44/02
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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