About: http://webisa.webdatacommons.org/184449993

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	A protective layer 332, constructed of a hard, non-magnetic material such as alumina may be provided above the P3 pole 320 to protect the structure from damage such as by abrasion, corrosion, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es