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发明名称
Line circuit for automatic telephone systems
摘要
申请公布号
US2489539(A)
申请公布日期
1949.11.29
申请号
US19470739059
申请日期
1947.04.03
申请人
STROMBERG-CARLSON COMPANY
发明人
POWELL WINFRED T.
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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