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发明名称
Signaling system and apparatus therefor
摘要
申请公布号
US2149219(A)
申请公布日期
1939.02.28
申请号
US19360092629
申请日期
1936.07.25
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
HOOVER RAY
分类号
H04B1/74;H04L5/22
主分类号
H04B1/74
代理机构
代理人
主权项
地址
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