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发明名称
Bottom rotation shaft actuator
摘要
申请公布号
GB2337781(A)
申请公布日期
1999.12.01
申请号
GB19990018065
申请日期
1998.01.30
申请人
CHARLES DAVID * HAILEY
发明人
CHARLES DAVID * HAILEY
分类号
E21B4/00;E21B31/107;(IPC1-7):E21B4/08
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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