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发明名称
RINGING ARRANGEMENT FOR TIME DIVISION TELEPHONE SYSTEMS
摘要
申请公布号
US3443033(A)
申请公布日期
1969.05.06
申请号
USD3443033
申请日期
1963.10.31
申请人
BELL TELEPHONE LAB. INC.
发明人
RONALD A. LOUIS
分类号
H04Q11/04;(IPC1-7):H01J3/00;H04M3/02
主分类号
H04Q11/04
代理机构
代理人
主权项
地址
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