About: http://webisa.webdatacommons.org/66440725

Property	Value
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	Pulleys, levers, and gears are a few examples of simple machines, mechanical devices that enhance our ability to move and manipulate objects.
http://www.w3.org/ns/prov#wasQuotedFrom	pbslearningmedia.org