About: http://webisa.webdatacommons.org/377411748

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	(B) observe or otherwise maintain continuous communication with the workers through visual, voice, signal line, telephone, radio, or other means suitable for the environment;
http://www.w3.org/ns/prov#wasQuotedFrom	ncradiation.net