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发明名称
Telephone system
摘要
申请公布号
US1819683(A)
申请公布日期
1931.08.18
申请号
US19300460017
申请日期
1930.06.09
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
LARSSON KNUT
分类号
H01H50/62;H04Q3/00
主分类号
H01H50/62
代理机构
代理人
主权项
地址
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