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发明名称
DUAL ROLLER-CUTTER DRILLING BIT
摘要
申请公布号
SU1745860(A1)
申请公布日期
1992.07.07
申请号
SU19894769768
申请日期
1989.12.15
申请人
VNII EKONOMIKI MINERALNOGO SYRYA GEOLOGORAZVEDOCHNYKH RABOT
发明人
PITERSKIJ VLADIMIR M,SU;PANIN NIKOLAJ M,SU;SMIRNOV VYACHESLAV G,SU;MANDZYUK VITALIJ D,SU
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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