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发明名称
Improvements in or relating to a rotary-percussion drill bit for drilling boreholes
摘要
申请公布号
GB1116790(A)
申请公布日期
1968.06.12
申请号
GB19670028755
申请日期
1966.03.14
申请人
HUGHES TOOL COMPANY
发明人
KELLY JOSEPH LEONARD
分类号
E21B10/56
主分类号
E21B10/56
代理机构
代理人
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地址
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