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发明名称
Improvements in map holders
摘要
申请公布号
GB688912(A)
申请公布日期
1953.03.18
申请号
GB19500003776
申请日期
1950.02.14
申请人
DENIS SIMPSON GUNNING
发明人
分类号
G09B29/10
主分类号
G09B29/10
代理机构
代理人
主权项
地址
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