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发明名称
APPARATUS FOR AUTOMATIC STABILIZING THE WEIGHT ON THE BIT OF DEEP DRILLINGS OF SUBSOIL EXPLORATION
摘要
申请公布号
HUT39833(A)
申请公布日期
1986.10.29
申请号
HU19850001185
申请日期
1985.03.29
申请人
FENYVESI,JANOS,HU
发明人
FENYVESI,JANOS,HU
分类号
A61F2/34;A61F2/46;(IPC1-7):E21C5/00
主分类号
A61F2/34
代理机构
代理人
主权项
地址
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