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发明名称
Monitor system insensitive to impedance variations
摘要
申请公布号
US2640094(A)
申请公布日期
1953.05.26
申请号
US19470794877
申请日期
1947.12.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GANNETT DANFORTH K.
分类号
H04H20/12
主分类号
H04H20/12
代理机构
代理人
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