About: http://webisa.webdatacommons.org/73106852

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	The disks or rings of FIG. 1 may be made of plastic, wood, cardboard or other material and may be shaped with two flat sides 14 and 16 as illustrated inFIG. 2.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com