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发明名称
Telephone system
摘要
申请公布号
US1771657(A)
申请公布日期
1930.07.29
申请号
US19260135531
申请日期
1926.09.15
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT, WERNERWERK
发明人
SCHULZ WERNER
分类号
H04M3/40
主分类号
H04M3/40
代理机构
代理人
主权项
地址
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