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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA379870(A)
申请公布日期
1939.03.07
申请号
CAD379870
申请日期
申请人
NORTHERN ELECTRIC COMPANY
发明人
HARRY G. EVERS
分类号
主分类号
代理机构
代理人
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地址
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