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发明名称
Telephone system
摘要
申请公布号
US1819685(A)
申请公布日期
1931.08.18
申请号
US19300418380
申请日期
1930.01.03
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
LUNDELL TORSTEN ADIL
分类号
H04M3/40;H04Q3/42
主分类号
H04M3/40
代理机构
代理人
主权项
地址
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