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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The screw and the wheel and axle on a hand powered drill, and the screw and lever on a car jack, are examples of simple machines that are used in more complex ones. ?? Previous Article: Learn About Thunderstorms
http://www.w3.org/ns/prov#wasQuotedFrom	hometrainingtools.com