About: http://webisa.webdatacommons.org/171929749

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	The object of my invention is to provide a combined circular letter and envelop, in which a return postal or other article or sample may be inclosed and sent through the mails.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com