About: http://webisa.webdatacommons.org/380434741

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	U.S. Pat. No. 4,214,658 discloses a smoking system in a single unit which allows the user to smoke different types of tobacco, limits the amount of tobacco smoked and provides an easy method of filling the smoking device with tobacco.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com