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发明名称
Toll switching telephone system
摘要
申请公布号
US2621258(A)
申请公布日期
1952.12.09
申请号
US19500181509
申请日期
1950.08.25
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
BALZER HARVEY W.
分类号
H04M3/60;H04Q3/00
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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