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发明名称
Improvements in or relating to speed indicators and speed-ratio indicators
摘要
申请公布号
GB346833(A)
申请公布日期
1931.04.20
申请号
GB19300001819
申请日期
1930.01.18
申请人
ARTHUR JOSEPH HERONIMOS
发明人
分类号
G01P3/40
主分类号
G01P3/40
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代理人
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