About: http://webisa.webdatacommons.org/336810794

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	Basically it uses different air volumes to control the bolt and it is generally very quiet compared to other markers but it usually has very bad effiency(sp).
http://www.w3.org/ns/prov#wasQuotedFrom	pbnation.com