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发明名称
Improvements in and relating to course-indicating apparatus for vehicles
摘要
申请公布号
GB525812(A)
申请公布日期
1940.09.05
申请号
GB19380034776
申请日期
1938.11.29
申请人
JOHN GORDON HARGRAVE;DENIS CEDRIC WILLIAMS
发明人
分类号
G09B29/10
主分类号
G09B29/10
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