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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA453306(A)
申请公布日期
1948.12.14
申请号
CAD453306
申请日期
申请人
NORTHERN ELECTRIC COMPANY
发明人
KARL L. BURGENER
分类号
主分类号
代理机构
代理人
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地址
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