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发明名称
Telegraph system
摘要
申请公布号
US1934687(A)
申请公布日期
1933.11.14
申请号
US19300500394
申请日期
1930.12.05
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
GARDNER LELAND A.
分类号
H04L12/00
主分类号
H04L12/00
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代理人
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