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发明名称
Data transmission
摘要
申请公布号
GB2261308(A)
申请公布日期
1993.05.12
申请号
GB19920010934
申请日期
1992.05.22
申请人
* GEC-MARCONI LIMITED
发明人
JOHN MICHAEL * BERESFORD
分类号
E21B44/00;E21B47/12;E21B47/18
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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