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经营范围
发明名称
Telephone line circuit
摘要
申请公布号
US2971060(A)
申请公布日期
1961.02.07
申请号
US19590809405
申请日期
1959.04.28
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
VAUGHAN HENRY E.
分类号
H04Q3/52
主分类号
H04Q3/52
代理机构
代理人
主权项
地址
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