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发明名称
Movable letter, word forming toy apparatus
摘要
申请公布号
US2564502(A)
申请公布日期
1951.08.14
申请号
US19500184660
申请日期
1950.09.13
申请人
RADFORD CAMERON M
发明人
RADFORD CAMERON M.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
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