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发明名称
Telephone system
摘要
申请公布号
US1923352(A)
申请公布日期
1933.08.22
申请号
US19320594065
申请日期
1932.02.19
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
WIESSNER ALFRED
分类号
H04Q3/00
主分类号
H04Q3/00
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