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发明名称
Educational contrivance
摘要
申请公布号
US2506894(A)
申请公布日期
1950.05.09
申请号
US19480027801
申请日期
1948.05.18
申请人
ROWE ORLO C
发明人
ROWE ORLO C.
分类号
G09B1/10;G09B19/00
主分类号
G09B1/10
代理机构
代理人
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