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发明名称
Signal system for telephone lines
摘要
申请公布号
US2712571(A)
申请公布日期
1955.07.05
申请号
US19510253345
申请日期
1951.10.26
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
HJERTSTRAND SVANTE LENNART
分类号
H04Q1/48
主分类号
H04Q1/48
代理机构
代理人
主权项
地址
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