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经营范围
发明名称
Teaching machine
摘要
申请公布号
US3334423(A)
申请公布日期
1967.08.08
申请号
US19640416751
申请日期
1964.12.08
申请人
LOIS HINTZE
发明人
HINTZE LOIS
分类号
G09B1/24
主分类号
G09B1/24
代理机构
代理人
主权项
地址
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