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发明名称
Telephone system
摘要
申请公布号
US2217084(A)
申请公布日期
1940.10.08
申请号
US19380188430
申请日期
1938.02.03
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
KONIG HERMANN-ERNST VON
分类号
H04Q1/32;H04Q3/42
主分类号
H04Q1/32
代理机构
代理人
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