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发明名称
Rotatable disc telephone index
摘要
申请公布号
US2786290(A)
申请公布日期
1957.03.26
申请号
US19530359384
申请日期
1953.06.03
申请人
EMILIO CERETTI
发明人
BOLZONI ERNESTO
分类号
B42F17/34
主分类号
B42F17/34
代理机构
代理人
主权项
地址
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