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发明名称
SEQUENTIAL CODED RINGING OF PARTY LINE TELEPHONES
摘要
申请公布号
US3428750(A)
申请公布日期
1969.02.18
申请号
USD3428750
申请日期
1964.05.12
申请人
JERROLD D. HOFFMAN
发明人
JERROLD D. HOFFMAN
分类号
G08B27/00;H04Q5/08;(IPC1-7):H04M11/04;H04Q5/00
主分类号
G08B27/00
代理机构
代理人
主权项
地址
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