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发明名称
Educational device
摘要
申请公布号
US2476580(A)
申请公布日期
1949.07.19
申请号
US19440555053
申请日期
1944.09.21
申请人
JACK BERGMAN
发明人
BERGMAN JACK
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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