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发明名称
OPERATOR'S TELEPHONE CIRCUIT
摘要
申请公布号
CA362421(A)
申请公布日期
1936.12.08
申请号
CAD362421
申请日期
申请人
THE WESTERN ELECTRIC COMPANY
发明人
HERMAN T. CHARTER
分类号
主分类号
代理机构
代理人
主权项
地址
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