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发明名称
Automatic telephone switching system
摘要
申请公布号
US2739186(A)
申请公布日期
1956.03.20
申请号
US19520284785
申请日期
1952.04.28
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
HERTOG MARTINUS DEN
分类号
H04Q1/18;H04Q3/00
主分类号
H04Q1/18
代理机构
代理人
主权项
地址
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