About: http://webisa.webdatacommons.org/332923885

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	Means for enclosing the mouth and nose are of flexible material and are preferably held on by straps such as Velcro??? straps or belts.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com