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发明名称
Telephone subscriber's supervisory circuits
摘要
申请公布号
US2977420(A)
申请公布日期
1961.03.28
申请号
US19590861910
申请日期
1959.12.24
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
LOWRY TERRELL N.
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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