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发明名称
VISUAL EDUCATION DEVICE
摘要
申请公布号
US3500556(A)
申请公布日期
1970.03.17
申请号
USD3500556
申请日期
1967.10.16
申请人
MULTISENSORY SYSTEMS
发明人
WILLIAM MOSKOWITZ
分类号
G09B1/02;G09B5/00;(IPC1-7):G09B19/00
主分类号
G09B1/02
代理机构
代理人
主权项
地址
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