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经营范围
发明名称
Rock drills
摘要
申请公布号
GB558868(A)
申请公布日期
1944.01.25
申请号
GB19420010262
申请日期
1942.07.22
申请人
LIONEL ALFRED BENNETT HUTTON
发明人
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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