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发明名称
Reglillas para cálculo abreviado.
摘要
申请公布号
ES23420(U)
申请公布日期
1950.07.01
申请号
ES19200000234U
申请日期
1950.03.13
申请人
MENÉNDEZ MENÉNDEZ, MIGUEL
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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