<http://webisa.webdatacommons.org/343260475> <http://www.w3.org/ns/prov#value> "In other words, the safety system is a system that issues an output only when the safe state is confirmed by the safety function and operates a machine." . <http://webisa.webdatacommons.org/prov/310706978> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/343260475> . <http://webisa.webdatacommons.org/343260475> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/343260475> <http://www.w3.org/ns/prov#wasQuotedFrom> <freepatentsonline.com> .