About: http://webisa.webdatacommons.org/451475382

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 no case should the critical angle be taken as greater than 26 degrees or 10 degrees where the presence or likelihood of surface moisture, oil or other conditions makes the roof slippery.
http://www.w3.org/ns/prov#wasQuotedFrom	australianscaffolds.com.au