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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA371524(A)
申请公布日期
1938.01.25
申请号
CAD371524
申请日期
申请人
THE WESTERN ELECTRIC COMPANY
发明人
WILLIAM HUGO MATTIES
分类号
主分类号
代理机构
代理人
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