Matches in DBpedia 2014 for { ?s ?p <http://dbpedia.org/resource/Category:Optical_instruments> . }
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- Disappearing-filament_pyrometer subject Category:Optical_instruments.
- Glossmeter subject Category:Optical_instruments.
- Interferometry subject Category:Optical_instruments.
- Mirror_galvanometer subject Category:Optical_instruments.
- Optical_instrument subject Category:Optical_instruments.
- Stauroscope subject Category:Optical_instruments.