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发明名称
Howler tone circuit involving a motor-driven interrupter
摘要
申请公布号
US2697792(A)
申请公布日期
1954.12.21
申请号
US19520309003
申请日期
1952.09.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MILLS JOHN K.
分类号
H04M3/14;H04M19/02
主分类号
H04M3/14
代理机构
代理人
主权项
地址
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