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发明名称
DRILLING BIT
摘要
申请公布号
SU1484898(A1)
申请公布日期
1989.06.07
申请号
SU19874194358
申请日期
1987.02.12
申请人
PROIZV GEOLOGICHESKOE OB PO RAZVEDKE NEFTI GAZA "UKHTANEFTEGAZGEOLOGIYA"
发明人
SKRYABIN GEORGIJ F,SU
分类号
E21B10/18
主分类号
E21B10/18
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代理人
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