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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA336632(A)
申请公布日期
1933.10.24
申请号
CAD336632
申请日期
申请人
THE NORTHERN ELECTRIC COMPANY
发明人
EDWARD SIGFORD PETERSON
分类号
主分类号
代理机构
代理人
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地址
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