About: http://webisa.webdatacommons.org/172713562

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	It will be understood that the ring body and vanes are preferably made of a metal such as spring steel, and also, the outer edges of each vane may be slightly beveled as indicated in FIG. 7 at 18a, 20a, 22a, 24a, 26a and 28a.
http://www.w3.org/ns/prov#wasQuotedFrom	google.ca