About: http://webisa.webdatacommons.org/99859971

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	A drawback to the construction shown in this patent, however, is that it incorporates a rather complicated positioning mechanism including cables, pulleys, drums, cable retainers, shafts, springs and other structural elements.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com