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发明名称
Telephone system
摘要
申请公布号
US1974164(A)
申请公布日期
1934.09.18
申请号
US19320627068
申请日期
1932.07.30
申请人
SIEMENS AND HALSKE AKTIENGESELLSCHAFT
发明人
SIMON FRANZ
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
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地址
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