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经营范围
发明名称
Educational appliance
摘要
申请公布号
US2398724(A)
申请公布日期
1946.04.16
申请号
US19440543283
申请日期
1944.07.03
申请人
AMERICAN AUTOMATIC TYPEWRITER COMPANY
发明人
SCHULZ OTTO
分类号
G09B9/16
主分类号
G09B9/16
代理机构
代理人
主权项
地址
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