Changes in the fleet of tractors in the Netherlands
1981
Vollaers, J.A. (Instituut voor Mechanisatie, Arbeid en Gebouwen, Wageningen (Netherlands))
Imports and inventories of agricultural tractors in the Netherlands are being analyzed over the period 1956-1979. It appears that engine power of the tractors increased steadily. Based on numerical data the average useful life of tractors is estimated at fifteen years
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