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经营范围
发明名称
Improvements in or relating to acoustic signalling means particularly for telephone sets
摘要
申请公布号
GB822098(A)
申请公布日期
1959.10.21
申请号
GB19570017707
申请日期
1957.06.04
申请人
WESTERN ELECTRIC COMPANY
发明人
分类号
G10K1/062;G10K9/13;G10K11/02;H04M1/02;H04M19/04;H04Q5/08;H04R11/14
主分类号
G10K1/062
代理机构
代理人
主权项
地址
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