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发明名称
Transmission of selector impulses or the like over duplexed lines
摘要
申请公布号
US1845571(A)
申请公布日期
1932.02.16
申请号
US19300476378
申请日期
1930.08.19
申请人
TELEFONAKTIEBOLAGET L. M. ERICSSON
发明人
TRECHCINSKI ROMAN
分类号
H04M17/02;H04Q1/48
主分类号
H04M17/02
代理机构
代理人
主权项
地址
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