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发明名称
Trunk circuit monitoring signal
摘要
申请公布号
US2685616(A)
申请公布日期
1954.08.03
申请号
US19520313667
申请日期
1952.10.08
申请人
STROMBERG-CARLSON COMPANY
发明人
PHARIS WILLIAM W.
分类号
H04M3/28
主分类号
H04M3/28
代理机构
代理人
主权项
地址
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