The Panama Canal's Gatun Lock and Gates, circa 1912.
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Image of the Lock and gates, construction not yet completed.

Credit: From Pennsylvania and Its Manifold Activities, 1912.

Much of the Panama Canal was built with Pittsburgh steel and Lehigh Valley cement. Completed in 1914, the Panama Canal was built with three pairs of reinforced concrete locks, with floors up to 20 feet thick, and walls that reached 60 feet at the base.

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