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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA401611(A)
申请公布日期
1941.12.23
申请号
CAD401611
申请日期
申请人
ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY
发明人
FREDERICK LUDWIG KAHN
分类号
主分类号
代理机构
代理人
主权项
地址
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