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经营范围
发明名称
Telegraph apparatus
摘要
申请公布号
US2291759(A)
申请公布日期
1942.08.04
申请号
US19400345305
申请日期
1940.07.13
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
ROTHERMEL SAMUEL W.
分类号
H04L17/22
主分类号
H04L17/22
代理机构
代理人
主权项
地址
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