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发明名称
Schwingungsorgan für Mikrophone, Lautsprecher u. dgl.
摘要
申请公布号
AT117396(B)
申请公布日期
1930.04.25
申请号
ATD117396
申请日期
1929.02.26
申请人
THE MULLARD RADIO VALVE CO. LTD.
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