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发明名称
TONE DETECTOR
摘要
申请公布号
US3544723(A)
申请公布日期
1970.12.01
申请号
USD3544723
申请日期
1968.11.29
申请人
BELL TELEPHONE LAB. INC.
发明人
RALPH N. BATTISTA
分类号
H04Q1/446;(IPC1-7):H04M1/50
主分类号
H04Q1/446
代理机构
代理人
主权项
地址
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