About: http://webisa.webdatacommons.org/70831840

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	Systems of the above mentioned kind are very expensive in their construction and especially for apparatus to effect their control.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com