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发明名称
PUNTA PERFORATRICE PER SCAVI IN MINIERA
摘要
申请公布号
IT1178643(B)
申请公布日期
1987.09.09
申请号
IT19840023810
申请日期
1984.11.29
申请人
CLEMENT F. GRAESSLE
发明人
MCKNIGHT HERMAN
分类号
E21B10/38;E21B10/58;(IPC1-7):E21B/
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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