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发明名称
LOUD-SPEAKING TELEPHONE ARRANGEMENTS
摘要
申请公布号
CA505833(A)
申请公布日期
1954.09.14
申请号
CAD505833
申请日期
申请人
PHILIPS LAMPS LIMITED
发明人
KENNETH E. LATIMER
分类号
主分类号
代理机构
代理人
主权项
地址
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