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发明名称
Telegraph system
摘要
申请公布号
US1944888(A)
申请公布日期
1934.01.30
申请号
US19310509798
申请日期
1931.01.19
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
HAGLUND HAKON H.
分类号
H04L25/42
主分类号
H04L25/42
代理机构
代理人
主权项
地址
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