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发明名称
Telegraph system
摘要
申请公布号
US1909350(A)
申请公布日期
1933.05.16
申请号
US19310551850
申请日期
1931.07.20
申请人
ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY
发明人
HARRISON HARRY HUGHES
分类号
H04L12/00
主分类号
H04L12/00
代理机构
代理人
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