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发明名称
FERNSPRECHENDVERSTAERKER.
摘要
申请公布号
DE1653370(U)
申请公布日期
1953.04.02
申请号
DE195200F4573U
申请日期
1952.10.20
申请人
EDGAR FRANK
发明人
EDGAR FRANK
分类号
主分类号
代理机构
代理人
主权项
地址
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