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发明名称
Telephone system
摘要
申请公布号
US2535512(A)
申请公布日期
1950.12.26
申请号
US19480051683
申请日期
1948.09.29
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
OSTLINE JOHN E.
分类号
H04M15/04;H04Q3/42
主分类号
H04M15/04
代理机构
代理人
主权项
地址
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