About: http://webisa.webdatacommons.org/52106133

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 barrier 25 is preferably made of light-transmitting materials such as glass or quartz so that it acts as a lens for the laser emitted from the tip 28.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com