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English definition of “tachograph”

tachograph

noun [C] uk   /ˈtæk.ə.ɡræf/ /-ɡrɑːf/ us    /-ɡræf/
a machine inside a vehicle such as a truck that records speed, distance travelled, and stopping periods, used to control the driver's legal hours of workThe interior of vehicles
(Definition of tachograph from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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