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Watch: Tough machines handle tough tasks while building the St. Lawrence Seaway

Construction of the St. Lawrence Seaway was a technological marvel in the 1950s, joining the Great Lakes with the ocean and adding a whole new route for cargo to reach the centre of the continent. That construction required plenty of large equipment, and this film - produced by Caterpillar and narrated by the legendary Walter Cronkite - shows that off as it walks through the building of key parts along the Seaway.

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