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发明名称
Improvements in signalling devices
摘要
申请公布号
GB748518(A)
申请公布日期
1956.05.02
申请号
GB19530024957
申请日期
1953.09.09
申请人
PAUL HENRY MACMAHON
发明人
分类号
B62J6/00;B62M3/12;G08B5/38
主分类号
B62J6/00
代理机构
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