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发明名称
EARTH BORING APPARATUS
摘要
申请公布号
GB2158129(B)
申请公布日期
1987.12.31
申请号
GB19850011132
申请日期
1985.05.02
申请人
* CEMENTATION CO INC
发明人
MARTIN DE GAUDRION * SALTER;JOHN GRAHAM SCOTT * HYND
分类号
E21B7/00;E21B11/06;E21D1/06;(IPC1-7):E21D1/06
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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