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发明名称
Visual educational device
摘要
申请公布号
US2387758(A)
申请公布日期
1945.10.30
申请号
US19410405308
申请日期
1941.08.04
申请人
ELIZABETH C. JAROS
发明人
JAROS JOSEPH F.
分类号
G03B23/12
主分类号
G03B23/12
代理机构
代理人
主权项
地址
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