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发明名称
Telephone system
摘要
申请公布号
US1944684(A)
申请公布日期
1934.01.23
申请号
US19320613355
申请日期
1932.05.25
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
EHRICKE ERICH
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
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地址
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