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发明名称
TOLL SWITCHING TELEPHONE SYSTEM
摘要
申请公布号
CA318921(A)
申请公布日期
1932.01.12
申请号
CAD318921
申请日期
申请人
THE WESTERN ELECTRIC COMPANY
发明人
WARREN WESLEY CARPENTER;RALPH EMERSON HERSEY
分类号
主分类号
代理机构
代理人
主权项
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