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发明名称
Educational picture exhibitor
摘要
申请公布号
US1825900(A)
申请公布日期
1931.10.06
申请号
US19310536594
申请日期
1931.05.11
申请人
ENGLAND HENRY C
发明人
ENGLAND HENRY C.
分类号
G09B1/24
主分类号
G09B1/24
代理机构
代理人
主权项
地址
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