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发明名称
SCHALLWIEDERGABEVORRICHTUNG MIT GETRENNTER WIEDERGABE DER NIEDRIGEN UND HOHEN FREQUENZEN.
摘要
申请公布号
DE1708913(U)
申请公布日期
1955.10.20
申请号
DE195300N3433U
申请日期
1953.09.12
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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