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经营范围
发明名称
Improvements in or relating to earth boring systems
摘要
申请公布号
GB307404(A)
申请公布日期
1930.01.09
申请号
GB19290007374
申请日期
1929.03.06
申请人
ASSOCIATED ELECTRICAL INDUSTRIES LIMITED
发明人
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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