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发明名称
Improvements in or relating to electrically operated signalling systems
摘要
申请公布号
GB759852(A)
申请公布日期
1956.10.24
申请号
GB19530007108
申请日期
1953.03.14
申请人
HUGH WOOD AND COMPANY LIMITED
发明人
DENHOLM GEORGE;NORDMANN LEONARD ARCHER
分类号
E21F17/18
主分类号
E21F17/18
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