About: http://webisa.webdatacommons.org/170184033

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 angle of the apex may be varied, such as between 40 and 120 degrees.
http://www.w3.org/ns/prov#wasQuotedFrom	patentgenius.com