About: http://webisa.webdatacommons.org/437310158

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	At timed intervals, e.g. about every 10-12 minutes, the locking mechanism 184 and then the cylinder 172 are actuated to swing the cleaning head 90 into the smelt spout to the position 90' as illustrated in FIG. 5.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com