Assertion: tractor's engine | /r/CapableOf | operate
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Source sentences:
text: In 1939, the Modena plant launched the first mass-produced tractor, the Fiat 40 Boghetto; thanks to an invention by Fortunato Boghetto, this tractor's engine was able to operate on a variety of fuels (kerosene, diesel, alcohol, petrol, natural gas and gasifier gas).