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发明名称
TELEPHONE SWITCHING APPARATUS
摘要
申请公布号
CA411946(A)
申请公布日期
1943.04.20
申请号
CAD411946
申请日期
申请人
NORTHERN ELECTRIC COMPANY
发明人
JOHN HENRY VOSS
分类号
主分类号
代理机构
代理人
主权项
地址
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