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摘要
申请公布号
US1756021(A)
申请公布日期
1930.04.29
申请号
US19290348387
申请日期
1929.03.20
申请人
GRAU ESCASENA ANTONIO
发明人
ESCASENA ANTONIO GRAU
分类号
G09F21/04
主分类号
G09F21/04
代理机构
代理人
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