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发明名称
TEACHING APPARATUS
摘要
申请公布号
US3538621(A)
申请公布日期
1970.11.10
申请号
USD3538621
申请日期
1967.11.16
申请人
WATARU MAYEDA
发明人
WATARU MAYEDA
分类号
G09B3/02;(IPC1-7):G09B3/02
主分类号
G09B3/02
代理机构
代理人
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地址
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