<http://webisa.webdatacommons.org/prov/152086270>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/12860405> .
<http://webisa.webdatacommons.org/12860405>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/12860405>	<http://www.w3.org/ns/prov#value>	"Patent US4391271 - Respirator circuit - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsThe respirator circuit of which the present invention is a part includes a water cascade for humidification of the air, oxygen enriched air or pure oxygen from a conventional respirator." .
<http://webisa.webdatacommons.org/12860405>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .