About: http://webisa.webdatacommons.org/189475335

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	FIG. 2 is a side elevational view of a roof covering made in accordance with this invention shown disposed in a coal seam.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com