About: http://webisa.webdatacommons.org/372961346

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	To all whom it may concern: Be it known that I, ,WILLARD THOMAS ing at Philadelphia,- Philadelphia county, Pennsylvania, have invented certain new and useful Improvementsin Valves, (Case B,) of which the following is a specification.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com