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发明名称
DEVICE FOR CENTERING A HIGHER END OF A STEM SECTION REMAINED IN A DRILLED HOLE
摘要
申请公布号
RO86206(B1)
申请公布日期
1985.03.31
申请号
RO19830109632
申请日期
1983.01.07
申请人
INTREPRINDEREA DE FORAJ SI LUCRARI GEOLOGICE SPECIALE
发明人
ANGHEL MARIN
分类号
E21B31/12
主分类号
E21B31/12
代理机构
代理人
主权项
地址
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