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发明名称
Teaching machine
摘要
申请公布号
US3172216(A)
申请公布日期
1965.03.09
申请号
US19610122731
申请日期
1961.07.10
申请人
MUEILER RICHARD C
发明人
MUEILER RICHARD C.
分类号
G09B7/02
主分类号
G09B7/02
代理机构
代理人
主权项
地址
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