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发明名称
TELEPHONE SIGNALLING SYSTEM
摘要
申请公布号
CA505804(A)
申请公布日期
1954.09.14
申请号
CAD505804
申请日期
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
DAVID H. RANSOM
分类号
主分类号
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代理人
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