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发明名称
Visual demonstrator
摘要
申请公布号
US2245110(A)
申请公布日期
1941.06.10
申请号
US19400315415
申请日期
1940.01.24
申请人
WILLIAM MARCACCIO
发明人
MARCACCIO WILLIAM
分类号
G09B23/18
主分类号
G09B23/18
代理机构
代理人
主权项
地址
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