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发明名称
Telephone system
摘要
申请公布号
US1929587(A)
申请公布日期
1933.10.10
申请号
US19320597197
申请日期
1932.03.07
申请人
SIEMENS & HALSKE, AKTIENGESELLSCHAFT
发明人
HOPF HANS
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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