Benjamin Holt invented the "caterpillar" tractor. Tractors
with wheels got stuck in soft soil. Benjamin invented a tractor that moved
on tracks instead of wheels. The tracks would not sink in sandy soil or
mud.
Benjamin started the Caterpillar Tractor Company. Today you see Benjamin
Holt's invention every time you see a bull dozer or even an army tank
that moves on tracks. Look at the pictures of Benjamin Holt's invention.
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