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发明名称
Multiexchange telephone system
摘要
申请公布号
US2493256(A)
申请公布日期
1950.01.03
申请号
US19440520502
申请日期
1944.01.31
申请人
TELEFONAKTIEBOLAGET L M ERICSSON
发明人
LUNDKVIST KARL AXEL
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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