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发明名称
Système de transmission téléphonique comprenant une ligne de transmission à distance et une ligne d'abonné
摘要
申请公布号
FR729131(A)
申请公布日期
1932.07.19
申请号
FRD729131
申请日期
1931.12.31
申请人
SIEMENS & HALSKE AKTIEN-GESELLSCHAFT
发明人
分类号
H04B3/40
主分类号
H04B3/40
代理机构
代理人
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