Definitions for tachograph
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Princeton's WordNet
tachograph(noun)
a tachometer that produces a graphical record of its readings; used to record the speed and duration of trips in a motor vehicle
Wiktionary
tachograph(Noun)
A device that records the distance and time traveled by a vehicle (especially a truck or coach), used to check the drivers' working time.
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"tachograph." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/tachograph>.