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cage in a mine shaft the device similar to an elevator car that is used for hoisting personnel and materials calorific value the quantity of heat that can

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c/gal cents per gallon c 4 h a mixture of light hydrocarbons that have the general formula c 4 h n where n is the number of hydrogen atoms per molecule

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a abutment - in coal mining 1 the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides which act as abutments of the arch

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fly ash - wikipedia

fly ash also known as quot pulverised fuel ash quot in the united kingdom is a coal combustion product composed of fine particles that are driven out of the boiler with the

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rex research established collects and disseminates reports about suppressed/dormant/emerging science inventions technologies experiments and

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