About: http://webisa.webdatacommons.org/199129908

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	However, in alternative embodiments in which other metals, such as gold and copper, are used to form the reflective layer 4, pretreatments to the tubing 3 that are standard in the gold and copper coating arts may be required.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com