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经营范围
发明名称
Prompting system
摘要
申请公布号
US2981144(A)
申请公布日期
1961.04.25
申请号
US19570682333
申请日期
1957.09.06
申请人
DE FRENES JOSEPH FLORIAN;LUDINGTON ROBERTS HORACE
发明人
FRENES JOSEPH FLORIAN DE;ROBERTS HORACE LUDINGTON
分类号
H04N5/222
主分类号
H04N5/222
代理机构
代理人
主权项
地址
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