About: http://webisa.webdatacommons.org/73903353

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	Duct system 10 may also be affixed to the ceiling 18 by engagement with a track system mounted on theceiling.A non-permanent mounting arrangement that combines different forms of fasteners is shown in FIG. 13.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com