About: http://webisa.webdatacommons.org/33262282

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	Said metal plate is usually of a heavy metal such as lead or lead alloys or layers of various selected metals that are assembled such that they achieve both optimal biological protection and suitable assembly rigidity.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com