About: http://webisa.webdatacommons.org/85728686

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	The switches 64 and 66 may be wired to an electrical signal such as an audio or visual alarm for alerting the operator of the overhead door 18.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com