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发明名称
Automatic telephone-exchange system
摘要
申请公布号
US1767962(A)
申请公布日期
1930.06.24
申请号
US19280309177
申请日期
1928.09.29
申请人
BELL TELEPHONE LABORATORIES
发明人
CLARK EDGAR H.;CARPENTER WARREN W.
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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