About: http://webisa.webdatacommons.org/456683632

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	An ancient type of roof support in mines utilized timbers and similar supports members including masonry walls and arches, steel timber sets, metal props, steel and masonry supports and others.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com