About: http://webisa.webdatacommons.org/137820009

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	While relays are preferred for switches S1-S4, it will be appreciated by persons skilled in the art that other types of switches, such as bipolar or MOS transistor switches, may be used.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com