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经营范围
发明名称
Telegraph recording and projecting system
摘要
申请公布号
US1969440(A)
申请公布日期
1934.08.07
申请号
US19310583712
申请日期
1931.12.29
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
WHEELER EVAN R.;DIRKES ROBERT F.
分类号
H04L13/18
主分类号
H04L13/18
代理机构
代理人
主权项
地址
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