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发明名称
채광드릴 날
摘要
내용 없음
申请公布号
KR850004138(A)
申请公布日期
1985.07.01
申请号
KR19840007447
申请日期
1984.11.28
申请人
클래먼트 에프 그래슬
发明人
허어만 맥나이트
分类号
E21B10/38;E21B10/58
主分类号
E21B10/38
代理机构
代理人
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