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发明名称
Vorrichtung zur Umwandlung von Schwingungen in Wechselströme, insbesondere für elektrische Wiedergabe von Tonaufnahmen.
摘要
申请公布号
AT120185(B)
申请公布日期
1930.12.10
申请号
ATD120185
申请日期
1929.03.11
申请人
LEONARD WALTER MURKHAM;RADOFONE (1928) LTD.
发明人
分类号
主分类号
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