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发明名称
TEACHING AID AND METHOD
摘要
申请公布号
US3608214(A)
申请公布日期
1971.09.28
申请号
USD3608214
申请日期
1969.07.11
申请人
PATRICIA M. RANCATI
发明人
PATRICIA M. RANCATI
分类号
G09B19/12;(IPC1-7):G09B19/12
主分类号
G09B19/12
代理机构
代理人
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地址
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