About: http://webisa.webdatacommons.org/110812060

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 hole is preferably left my masking but can also be made using machining or other appropriate methods.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au