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发明名称
Automatic telephone system involving separate operator and subscriber register sender apparatus
摘要
申请公布号
US2569650(A)
申请公布日期
1951.10.02
申请号
US19460719026
申请日期
1946.12.28
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
BALZER HARVEY W.;OSTLINE JOHN E.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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