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发明名称
Spelling device
摘要
申请公布号
US2838847(A)
申请公布日期
1958.06.17
申请号
US19520294128
申请日期
1952.06.18
申请人
ZALKIND ALBERT M
发明人
ZALKIND ALBERT M.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
主权项
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