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经营范围
发明名称
ROCK-DRILLING BIT FOR PERCUSSION HAMMERS
摘要
申请公布号
GB1556589(A)
申请公布日期
1979.11.28
申请号
GB19770027314
申请日期
1977.06.30
申请人
LISTER W
发明人
分类号
E21B4/14;E21B10/38;E21B10/56;E21B17/07;(IPC1-7):E21B9/02
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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