About: http://webisa.webdatacommons.org/310488663

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	These boat guards 20 may be of any refractory material such as graphite, may have rectangular outer outline and have a central hole through which the boat fits.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com