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发明名称
TELEPHONE EXCHANGE SYSTEM
摘要
申请公布号
CA325839(A)
申请公布日期
1932.09.06
申请号
CAD325839
申请日期
申请人
THE WESTERN ELECTRIC COMPANY
发明人
GEORGE CLIFFORD HARTLEY;EDMOND PHILIP GOODWIN WRIGHT
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主分类号
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代理人
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