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经营范围
发明名称
Transistorized keying and mark-hold unit
摘要
申请公布号
US2794856(A)
申请公布日期
1957.06.04
申请号
US19540452525
申请日期
1954.08.27
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
TURNER FRANK T.
分类号
H04L25/22
主分类号
H04L25/22
代理机构
代理人
主权项
地址
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