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经营范围
发明名称
System of electromagnetic sound recording on metallic plates, ribbons or wires
摘要
申请公布号
GB497800(A)
申请公布日期
1938.12.28
申请号
GB19370017999
申请日期
1937.06.28
申请人
LUIGI MARZOCCHI
发明人
分类号
G11B5/53;H04N5/782
主分类号
G11B5/53
代理机构
代理人
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地址
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