No single person can be credited with this. During the 1860's many men and companies developed steam tractors all over the world. Britain and USA seemed to lead this technology. Development was slow as were the machines, - they were huge, ponderous and powerful. Great companies like Case, Caterpiller, Moline, Holt and many others all started out with steam tractors.
Mrs. Frisby was alarmed when she discovered that her house was going to be plowed over by the farmer's tractor. This would put her and her family in danger of being crushed or killed.
a John deer tractor
tractor
A tractor is a noun.
tractor
with tractor parts
U Can Use Tractor tires to run A farm Tractor
What did I the farmer say when he lost his tractor
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tractor trailer
tractor
The prefix for "tractor" is "trac-".