About: http://webisa.webdatacommons.org/396877063

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	Therefore, due to the amount of material used to make these tubes, the cost of the equipment and the manufacturing method used, these tubes are relatively expensive, especially for people residing in developing countries.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com