About: http://webisa.webdatacommons.org/36822074

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	With the handle end of a blunt instrument, such as a hammer, press down on the valve heads once or twice to check their movement.
http://www.w3.org/ns/prov#wasQuotedFrom	maritime.org