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发明名称
ROTARY DRILLING BIT
摘要
申请公布号
SU1721211(A1)
申请公布日期
1992.03.23
申请号
SU19894696983
申请日期
1989.04.11
申请人
AZERB I NEFTI KHIMII IM.M.AZIZBEKOVA
发明人
GASANOV RAMIZ A,SU
分类号
E21B10/43;E21B10/42;E21B10/46
主分类号
E21B10/43
代理机构
代理人
主权项
地址
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