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发明名称
Frequency modulated telephone ringing system
摘要
申请公布号
US3342948(A)
申请公布日期
1967.09.19
申请号
US19640354326
申请日期
1964.03.24
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
KNAUER HANS-ULRICH;KONOLD ARMIN
分类号
H04M19/02;H04M19/04;H04Q1/446
主分类号
H04M19/02
代理机构
代理人
主权项
地址
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