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发明名称
PULSATION-PUMPING HYDRAULIC HAMMER
摘要
申请公布号
SU1599511(A1)
申请公布日期
1990.10.15
申请号
SU19874286225
申请日期
1987.07.20
申请人
PROIZV GEOLOGICHESKOE OB TS RAJONOV RSFSR
发明人
EGOROV NIKOLAJ G,SU
分类号
E21B4/16
主分类号
E21B4/16
代理机构
代理人
主权项
地址
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