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发明名称
Telephone system
摘要
申请公布号
US2070909(A)
申请公布日期
1937.02.16
申请号
US19350005343
申请日期
1935.02.07
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
LUBBERGER FRITZ
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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