Matches in DBpedia 2016-04 for { ?s ?p <http://dbpedia.org/resource/Category:Piston_engines> }
- Category:Engines_by_cylinder_layout broader Category:Piston_engines.
- Category:Free-piston_engines broader Category:Piston_engines.
- Category:Internal_combustion_piston_engines broader Category:Piston_engines.
- Category:Piston_engine_combustion_chambers broader Category:Piston_engines.
- Category:Piston_engine_configurations broader Category:Piston_engines.
- Category:Pistons broader Category:Piston_engines.
- Category:Rolls-Royce_piston_engines broader Category:Piston_engines.