| http://www.w3.org/ns/prov#value | - -by-step progression through a procedure or system especially using connecting lines and a set of conventional symbols. ??? ??? ??? Fluid Power Use of liquids or gases under pressure to move objects or perform other tasks. ??? ??? ??? Fuel Cell Device that combines hydrogen, or other fuels, and oxygen and produces electricity in the process. ??? ??? ??? Hydraulics Fluid power system that uses wate
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