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发明名称
Improvements relating to ice penetrating devices
摘要
申请公布号
GB9013661(D0)
申请公布日期
2001.10.31
申请号
GB19900013661
申请日期
1990.06.19
申请人
GEC-MARCONI LIMITED
发明人
分类号
B63B22/00;E21B7/00;E21B7/14
主分类号
B63B22/00
代理机构
代理人
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