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Cranes lift heavy things high up to help build tall buildings.

Cranes lift heavy things high up to help build tall buildings.

A long arm and a strong cable pull loads up into the air. Cranes can lift steel beams many floors high.

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Excavators use a big metal arm and bucket to dig holes in the ground. Excavators use a big metal arm and bucket to dig holes in the ground. Dump trucks carry heavy loads of dirt and tip them out the back. Dump trucks carry heavy loads of dirt and tip them out the back. Bulldozers push piles of dirt with a big flat blade at the front. Bulldozers push piles of dirt with a big flat blade at the front. Cement mixer trucks spin around to keep the wet concrete soft. Cement mixer trucks spin around to keep the wet concrete soft. The biggest dump trucks have tyres taller than a grown-up person. The biggest dump trucks have tyres taller than a grown-up person.