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经营范围
发明名称
TEACHING DEVICE
摘要
申请公布号
US3477146(A)
申请公布日期
1969.11.11
申请号
USD3477146
申请日期
1967.01.26
申请人
RICHARD J. WARNEKE
发明人
RICHARD J. WARNEKE
分类号
G09B1/28;(IPC1-7):G09B1/16;G09F11/30
主分类号
G09B1/28
代理机构
代理人
主权项
地址
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