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经营范围
发明名称
TEACHING MACHINES
摘要
申请公布号
US3609878(A)
申请公布日期
1971.10.05
申请号
USD3609878
申请日期
1969.05.19
申请人
MARTIN L. BENDER
发明人
MARTIN L. BENDER
分类号
G09B7/06;(IPC1-7):G09B7/06
主分类号
G09B7/06
代理机构
代理人
主权项
地址
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