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发明名称
Dial telephone office arranged for register-sender control of two-motion step-by-step switches having multilevel trunk groups
摘要
申请公布号
US2986604(A)
申请公布日期
1961.05.30
申请号
US19570682523
申请日期
1957.09.06
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MCKIM BURTON
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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