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发明名称
Círculo logarítmico de cálculo, perfeccionado
摘要
申请公布号
ES29919(U)
申请公布日期
1952.04.01
申请号
ES19190000299U
申请日期
1952.03.01
申请人
BALCELLS GORINA, ALBERTO
发明人
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主分类号
代理机构
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