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发明名称
Practice keyboard
摘要
申请公布号
US2828661(A)
申请公布日期
1958.04.01
申请号
US19540430032
申请日期
1954.05.17
申请人
BEATRICE ROYT;CARABO CONE MADELEINE
发明人
ROYT BEATRICE;CONE MADELEINE CARABO
分类号
G09B15/08
主分类号
G09B15/08
代理机构
代理人
主权项
地址
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