About: central vacuum system

Premodifier: central vacuum
Head noun: system

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

Broader concepts

label	provenance	confidence
progressive feature	isap:445461594	0.743103
technological innovation	isap:17688856	0.673885
amenity	isap:442336726	0.453513

Narrower concepts

label	provenance	confidence