About: http://webisa.webdatacommons.org/309331530

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	Photographs, drawings, flyers, patent records, incorporation records and other material pertaining to the Whitlock metered mailing machine, which was authorized by the United States Postal Service, 1925-1930.
http://www.w3.org/ns/prov#wasQuotedFrom	nhm.org