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经营范围
发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA431484(A)
申请公布日期
1945.11.27
申请号
CAD431484
申请日期
申请人
AUTOMATIC ELECTRIC LABORATORIES;ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY
发明人
THOMAS FREDERICK CROCKER
分类号
主分类号
代理机构
代理人
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