About: http://webisa.webdatacommons.org/18364625

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	Belt-driven openers use a polyurethane belt (or Kevlar or fiberglass or some other material???different types of belts are available) to push/pull the trolley.
http://www.w3.org/ns/prov#wasQuotedFrom	costowl.com