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发明名称
METHOD OF FORMING EXPANDED PORTION OF BOREHOLE
摘要
申请公布号
SU749987(A1)
申请公布日期
1980.07.23
申请号
SU19772494539
申请日期
1977.06.06
申请人
NII STROITELNYKH KONSTRUKTSIJ GOSSTROYA SSSR
发明人
FIL YURIJ A,SU;TKACHENKO LEONID ,SU;SHISHKO GRIGORIJ F,SU;METELYUK NIKOLAJ S,SU
分类号
E21B47/08;E02D27/12;E21B7/28;(IPC1-7):E21B47/08
主分类号
E21B47/08
代理机构
代理人
主权项
地址
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