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经营范围
发明名称
Improvements in or relating to circuit arrangements for automatic telephone installations
摘要
申请公布号
GB712013(A)
申请公布日期
1954.07.14
申请号
GB19520018689
申请日期
1952.07.23
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H04Q1/45;H04Q3/00
主分类号
H04Q1/45
代理机构
代理人
主权项
地址
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