About: http://webisa.webdatacommons.org/202926429

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	Note that the beam has sort of a cone shape, so the longer the space you need it to guard, the more you need to angle the virtual wall outward to avoid its covering some of the space you???d actually like cleaned.
http://www.w3.org/ns/prov#wasQuotedFrom	epinions.com