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发明名称
Semiautomatic telephone system
摘要
申请公布号
US1832306(A)
申请公布日期
1931.11.17
申请号
US19300448488
申请日期
1930.04.30
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KILLE LINDLEY A.
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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