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发明名称
LOCATING DEVICE FOR SOIL DISPLACEMENT HAMMERS
摘要
申请公布号
GB8727218(D0)
申请公布日期
1987.12.23
申请号
GB19870027218
申请日期
1987.11.20
申请人
HOLLOWAY EQUIPMENT SALES LTD
发明人
分类号
E21B7/04;E21B7/26;E21B47/022;E21B47/12
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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