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经营范围
发明名称
Improvement in or relating to electrical machines
摘要
申请公布号
GB9518266(D0)
申请公布日期
1995.11.08
申请号
GB19950018266
申请日期
1995.09.08
申请人
CAMCO DRILLING GROUP LIMITED
发明人
分类号
E21B41/00;H02K5/128
主分类号
E21B41/00
代理机构
代理人
主权项
地址
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