<http://webisa.webdatacommons.org/157280353> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/157280353> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.com> . <http://webisa.webdatacommons.org/prov/322712914> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/157280353> . <http://webisa.webdatacommons.org/157280353> <http://www.w3.org/ns/prov#value> "At step 304, the device identifies an R-wave on the ventricular channel and determines its amplitude and other characteristics." .