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发明名称
Supervisory alarm system for telephone interrupters
摘要
申请公布号
US2442427(A)
申请公布日期
1948.06.01
申请号
US19460659209
申请日期
1946.04.03
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
MULLERHEIM KURT
分类号
H04M3/24
主分类号
H04M3/24
代理机构
代理人
主权项
地址
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