About: http://webisa.webdatacommons.org/272354598

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 compression rings 214 and compression rings 232 are preferably made of metal although they may be made of other durable materials including plastic.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com