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经营范围
发明名称
Educational device
摘要
申请公布号
US1854999(A)
申请公布日期
1932.04.19
申请号
US19300469597
申请日期
1930.07.21
申请人
BLOUNT RALLS
发明人
RALLS BLOUNT
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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