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经营范围
发明名称
TEACHING MACHINE
摘要
申请公布号
US3608208(A)
申请公布日期
1971.09.28
申请号
USD3608208
申请日期
1969.06.18
申请人
FRED W. WILLARDSON
发明人
FRED W. WILLARDSON
分类号
G09B7/08;(IPC1-7):G09B5/02
主分类号
G09B7/08
代理机构
代理人
主权项
地址
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