Word: shales
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Dates: during 1920-1929
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...temperature system invented by Charles C. Bussey, of New York, is in successful operation at Louisville, Ky. It differs in method from the Piron system, but gives somewhat similar results. It utilizes inferior bituminous coal and oil shale, and yields by-products of fuel oil, gas, ammonia and benzol, while eliminating sulphur and phosphorus from the coke...