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发明名称
PORTABLE TEACHING MACHINES
摘要
申请公布号
CA693785(A)
申请公布日期
1964.09.08
申请号
CAD693785
申请日期
申请人
DUDLEY E. CORNELL, III
发明人
DUDLEY E. CORNELL, III
分类号
主分类号
代理机构
代理人
主权项
地址
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