@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_piston_	skos:broader	isac:engine_system_ .
isac:_engine_	skos:broader	isac:engine_system_ .
isac:_timing_	skos:broader	isac:engine_system_ .
isac:_turbocharger_	skos:broader	isac:engine_system_ .