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经营范围
发明名称
Electrical selecting and indicating system
摘要
申请公布号
US1976398(A)
申请公布日期
1934.10.09
申请号
US19290406357
申请日期
1929.11.11
申请人
THE WESTERN UNION TELEGRPAH COMPANY
发明人
HOOVER RAY
分类号
H04L12/18
主分类号
H04L12/18
代理机构
代理人
主权项
地址
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