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发明名称
Educational device
摘要
申请公布号
US1798647(A)
申请公布日期
1931.03.31
申请号
US19300420461
申请日期
1930.01.13
申请人
B. B. & R. KNIGHT CORPORATION
发明人
ANTHONY ROBERT L.
分类号
G09B1/00
主分类号
G09B1/00
代理机构
代理人
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