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发明名称
Model for geometry instruction
摘要
申请公布号
US1810421(A)
申请公布日期
1931.06.16
申请号
US19280276737
申请日期
1928.05.10
申请人
JEAN GUYER
发明人
GUYER JEAN
分类号
G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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