About: http://webisa.webdatacommons.org/200269051

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 vacuum chamber 16 preferably comprises a wall 22 of beryllium, beryllium oxide, aluminum, aluminum oxide, pyrolytic boron nitride, graphite or other such metal or ceramic materials, which is transparent to x-rays.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com