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发明名称
Educational device
摘要
申请公布号
US2618078(A)
申请公布日期
1952.11.18
申请号
US19470733866
申请日期
1947.03.11
申请人
WEIL RUDOLF F
发明人
WEIL RUDOLF F.
分类号
A63H33/22;G09B1/06
主分类号
A63H33/22
代理机构
代理人
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地址
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