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发明名称
Improvements in or relating to telephone apparatus
摘要
申请公布号
GB513869(A)
申请公布日期
1939.10.24
申请号
GB19380012031
申请日期
1938.04.21
申请人
SIEMENS APPARATE UND MASCHINEN GESELLSCHAFT MIT BESCHRAENKTER HAFTUNG
发明人
分类号
H04R1/10
主分类号
H04R1/10
代理机构
代理人
主权项
地址
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