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经营范围
发明名称
VOICE FREQUENCY SIGNALING CIRCUIT
摘要
申请公布号
CA499774(A)
申请公布日期
1954.02.02
申请号
CAD499774
申请日期
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
ALLAN WEAVER;WALTER W. FRITSCHI;ROBERT O. SOFFEL
分类号
主分类号
代理机构
代理人
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