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发明名称
TEACHING DEVICE
摘要
申请公布号
US3597854(A)
申请公布日期
1971.08.10
申请号
USD3597854
申请日期
1969.12.22
申请人
EDWINA P. TRIMMER
发明人
EDWINA P. TRIMMER
分类号
G09B19/02;(IPC1-7):G09B3/00
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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