About: http://webisa.webdatacommons.org/44828683

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	Construction and building materials, especially roofing and asphalt, were the mainstays of the company through the 1970s.
http://www.w3.org/ns/prov#wasQuotedFrom	hbs.edu