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经营范围
发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB431946(A)
申请公布日期
1935.07.18
申请号
GB19340001839
申请日期
1934.01.18
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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