About: emission control system

Premodifier: emission control
Head noun: system

Same concepts
http://dbpedia.org/resource/Vehicle_emissions_control

Broader concepts

label	provenance	confidence
parameter	isap:420926717	0.287390

Narrower concepts

label	provenance	confidence
scrubber	isap:483883997	0.425045
engine	isap:387764034	0.123762