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发明名称
Dispositivo de medición y anotación de conferencias telefónicas.
摘要
申请公布号
ES19217(Y)
申请公布日期
1949.07.01
申请号
ES19170000192U
申请日期
1949.01.19
申请人
OLMO MARÍN, MANUEL DEL
发明人
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主分类号
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