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经营范围
发明名称
EDUCATIONAL DEVICE
摘要
申请公布号
US3460273(A)
申请公布日期
1969.08.12
申请号
USD3460273
申请日期
1967.05.08
申请人
JOHNYE G. BOYD
发明人
JOHNYE G. BOYD
分类号
G09B17/00;(IPC1-7):G09B21/00;G09B19/00
主分类号
G09B17/00
代理机构
代理人
主权项
地址
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