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发明名称
Circulating sub
摘要
申请公布号
EP0787888(A3)
申请公布日期
1998.05.20
申请号
EP19960306334
申请日期
1996.09.02
申请人
SPECIALTY TOOLS LIMITED
发明人
MCDONALD, ANDREW
分类号
E21B21/10;(IPC1-7):E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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