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发明名称
Telegraph system
摘要
申请公布号
US2154441(A)
申请公布日期
1939.04.18
申请号
US19350027238
申请日期
1935.06.18
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
D'HUMY FERNAND E.;FRANKLIN LAWRENCE W.
分类号
H04M11/06
主分类号
H04M11/06
代理机构
代理人
主权项
地址
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