About: private branch exchange

Premodifier: private branch
Head noun: exchange

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

Broader concepts

label	provenance	confidence
communication equipment	isap:185347506	0.748320
network element	isap:341827925	0.738816
switching system	isap:478810431	0.726077
phone system	isap:478810452	0.640122
device	isap:480345718	0.637304
telephone network	isap:347359497	0.580759
communication	isap:153069790	0.532655
telephone exchange	isap:57996822	0.520116
pbx	isap:348916800	0.489297
office	isap:485421055	0.361928
service	isap:344852133	0.278284

Narrower concepts

label	provenance	confidence
apparatus	isap:409547544	0.164332
service	isap:48367837	0.145962