Beck tunnel boring machine/Definition

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https://en.citizendium.org/wiki/index.php?title=Beck_tunnel_boring_machine/Definition&printable=yes
A definition or brief description of Beck tunnel boring machine.

The largest tunnel boring machine in the world, when it was operated by Ontario Hydro, from 2006 to 2011, bored a 14.4 m (47.24 ft) diameter tunnel from the upper Niagara River to the Sir Adam Beck Hydroelectric Plant

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