Χαχα....εσένα ρωταω. (gsb)
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The Zerograph as well as the Centrograph are instruments of very high precision, to calculate intermediaiy consecutive times, i.e. when it is necessary, in one single operation, to stop, go back to zero and restart the seconds hand, for either sports use, car racing, motorbyke, bicycle, or even to calculate the production times of manufacturing process