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发明名称
Improvements in or relating to audio-frequency signalling systems
摘要
申请公布号
GB704650(A)
申请公布日期
1954.02.24
申请号
GB19520017599
申请日期
1952.07.11
申请人
TELEFONAKTIEBOLAGET L M ERICSSON
发明人
分类号
H04M1/50;H04Q1/446;H04Q3/00
主分类号
H04M1/50
代理机构
代理人
主权项
地址
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