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发明名称
Educational device
摘要
申请公布号
US3314165(A)
申请公布日期
1967.04.18
申请号
US19640380255
申请日期
1964.07.06
申请人
SHRECK PETER K;HOWE THOMAS B
发明人
SHRECK PETER K.;HOWE THOMAS B.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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