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发明名称
ARRANGEMENT FOR CLEANING AN AUGER-TYPE DRILLING COLUMN
摘要
申请公布号
SU1222814(A1)
申请公布日期
1986.04.07
申请号
SU19843756695
申请日期
1984.06.29
申请人
REVOLYUTSII I GORNOGO DELA IM.A.A.SKOCHINSKOGO
发明人
KOLYAGIN VIKTOR M,SU;MAKAROV GENNADIJ P,SU
分类号
E21B17/22;(IPC1-7):E21B17/22
主分类号
E21B17/22
代理机构
代理人
主权项
地址
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