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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA301282(A)
申请公布日期
1930.06.17
申请号
CAD301282
申请日期
申请人
THE WESTERN ELECTRIC COMPANY
发明人
LEWIS HOWES JOHNSON
分类号
主分类号
代理机构
代理人
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地址
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