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Abstract Running speed is an important index of explosion-proof diesel l non - rail rubber wheel vehicle, and how to measure the speed remains a research subject. Velocity tester based on GPS by studying the current rubber wheel speed tester, the equipment with accurate test, small size, easy operation and tracing data source, two functions of testing the speed of the rubber wheel and the braking distance, the equipment solved the complex install of current tester which is confined to ground factors, with promotion value.
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