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发明名称
ALTERNATING CURRENT SIGNALLING SYSTEMS
摘要
申请公布号
CA511601(A)
申请公布日期
1955.04.05
申请号
CAD511601
申请日期
申请人
INTERNATIONAL STANDARD ELECTRIC CORPORATION
发明人
WILLIAM F. GOULD;THOMAS F. S. HARGREAVES
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