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经营范围
发明名称
Improvements in educational appliances
摘要
申请公布号
GB484851(A)
申请公布日期
1938.05.11
申请号
GB19370014429
申请日期
1937.05.24
申请人
DANIEL GARTHE;PAUL GARTHE
发明人
分类号
G09B19/14
主分类号
G09B19/14
代理机构
代理人
主权项
地址
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