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发明名称
Telephone test selector
摘要
申请公布号
US2564013(A)
申请公布日期
1951.08.14
申请号
US19490099739
申请日期
1949.06.17
申请人
STROMBERG-CARLSON COMPANY
发明人
KESSLER FRANK
分类号
H04Q1/26
主分类号
H04Q1/26
代理机构
代理人
主权项
地址
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