About: http://webisa.webdatacommons.org/196368808

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	In the tower there is a mechanical computer known as an ???interlocking grid.??? It prevents the operator from pulling levers in an order that would cause a rail collision.
http://www.w3.org/ns/prov#wasQuotedFrom	ecrm5700.org