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发明名称
Improvements in duplex telegraphy
摘要
申请公布号
GB362452(A)
申请公布日期
1931.12.04
申请号
GB19300026394
申请日期
1930.09.04
申请人
CREED AND COMPANY, LIMITED;RONALD GEORGE GRIFFITH
发明人
分类号
H04L5/14
主分类号
H04L5/14
代理机构
代理人
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