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发明名称
Telephone exchange system
摘要
申请公布号
US1844111(A)
申请公布日期
1932.02.09
申请号
US19300458663
申请日期
1930.05.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
STOKELY RAY L.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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