About: http://webisa.webdatacommons.org/22204079

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 multiplication display board 15 is constructed of durable material, such as wood or plastic, and is rectangular or nearly square in configuration to match the dimensions provided by the internal side walls 18', 19', 20', and 21'.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com