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发明名称
DEVICE FOR SINKING HOLES IN EARTH
摘要
申请公布号
SU791904(A1)
申请公布日期
1980.12.30
申请号
SU19782641260
申请日期
1978.06.06
申请人
MAKEEVSKIJ INZH-STR INSTITUT
发明人
PENCHUK VALENTIN A,SU;TIMOSHKO ALEKSANDR ,SU
分类号
E21B10/44;(IPC1-7):E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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