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发明名称
Carbón negativo para proyector
摘要
申请公布号
ES31605(Y)
申请公布日期
1956.02.16
申请号
ES19050000316U
申请日期
1952.06.17
申请人
C. CONRADTY
发明人
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主分类号
代理机构
代理人
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