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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA304261(A)
申请公布日期
1930.09.23
申请号
CAD304261
申请日期
申请人
THE NORTHERN ELECTRIC COMPANY
发明人
NORMAN H. SAUNDERS
分类号
主分类号
代理机构
代理人
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