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发明名称
Alternating-current signaling system
摘要
申请公布号
US2577755(A)
申请公布日期
1951.12.11
申请号
US19480023438
申请日期
1948.04.27
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
HARGREAVES THOMAS FREDERICK STANLEY;GOULD WILLIAM FREDERICK
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
主权项
地址
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