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发明名称
Буровой инструмент для ударно-вращательного бурения
摘要
申请公布号
SU30217(A1)
申请公布日期
1933.05.31
申请号
SU19310084640
申请日期
1931.03.07
申请人
LAVRENTEV K.G.
发明人
LAVRENTEV K.G.
分类号
E21B4/14
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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