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发明名称
GROUND DRILLING
摘要
申请公布号
GB8306952(D0)
申请公布日期
1983.04.20
申请号
GB19830006952
申请日期
1983.03.14
申请人
SHIGA, S
发明人
分类号
E02D5/38;E21B7/00;E21B21/12;E21B25/10;E21B25/14;(IPC1-7):E21B11/02
主分类号
E02D5/38
代理机构
代理人
主权项
地址
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