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发明名称
Speed governor
摘要
申请公布号
GB0217682(D0)
申请公布日期
2002.09.11
申请号
GB20020017682
申请日期
2001.12.04
申请人
ROTECH HOLDINGS LIMITED
发明人
分类号
E21B4/02;E21B21/10;E21B44/00
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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