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经营范围
发明名称
Improvements relating to telephone instrument circuits
摘要
申请公布号
GB455807(A)
申请公布日期
1936.10.28
申请号
GB19350018758
申请日期
1935.07.01
申请人
SIEMENS BROTHERS & CO. LIMITED;GEORGE WILLIAM SUTTON;WILLIAM HERBERT GRINSTED
发明人
分类号
H04M1/738;H04R21/02
主分类号
H04M1/738
代理机构
代理人
主权项
地址
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