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发明名称
TEACHING AID AND METHOD
摘要
申请公布号
US3452449(A)
申请公布日期
1969.07.01
申请号
USD3452449
申请日期
1966.05.12
申请人
JOHN MITCHELL
发明人
JOHN MITCHELL
分类号
G09B7/06;(IPC1-7):C09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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