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发明名称
Apparatus for monitoring a plurality of telegraph loops
摘要
申请公布号
US2808457(A)
申请公布日期
1957.10.01
申请号
US19560567662
申请日期
1956.02.24
申请人
STELMA, INC.
发明人
CARVER LAWRENCE M.
分类号
H04L12/26
主分类号
H04L12/26
代理机构
代理人
主权项
地址
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