| http://www.w3.org/ns/prov#value | - Fossil fuel, as the term is used in this invention, is intended to include anthracite and bituminous coal, lignite, crude petroleum, shale oil, oil from tar sands, natural gas, as well as fuels derived from physical separation, or more profound transformations, of these materials, including coked coal, petroleum coke, gas oil, residua from petroleum distillation, and two or more of any of the fore
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