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Updated: July 7, 2026
"With power-cost at half a cent per H.P. hour, about $2.50 a ton. The oxygen by-product alone will more than pay for that, in purifying and cooling buildings, or used to promote combustion in locomotives and other steam engines. The liquid air itself can be used as a motive power for a certain type of expansion engine, or " "There, there, that's enough!" interposed Flint, brusquely.
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