About: http://webisa.webdatacommons.org/361413204

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 4K was introduced in about 1973: about is a word you have to use quite a lot when dealing with the old Soviet Union, where everything was a state secret.
http://www.w3.org/ns/prov#wasQuotedFrom	shutterbug.com