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发明名称
EARTH BORING APPARATUS
摘要
申请公布号
GB1564369(A)
申请公布日期
1980.04.10
申请号
GB19770049687
申请日期
1977.11.29
申请人
DRESSER INDUSTRIES INC
发明人
分类号
E21B10/16;D07B1/06;E21B10/52;E21B10/56;(IPC1-7):E21B10/52
主分类号
E21B10/16
代理机构
代理人
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地址
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