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发明名称
Telephone ringer circuit
摘要
申请公布号
US3223788(A)
申请公布日期
1965.12.14
申请号
US19620204433
申请日期
1962.06.22
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
HAWLEY MELVILLE S.;MCLELLAN DONALD W.
分类号
H04M19/04;H04Q5/02
主分类号
H04M19/04
代理机构
代理人
主权项
地址
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