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optical square comprises two pentaprisms of quality optical glass, housed in a sturdy aluminium casing, ekker, mis sisaldab kahte alumiinimumkorpuses hoitavat kvaliteetsest optilisest klaasist pentaprismat
kahe peegliga ekker . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/kahe%20peegliga%20ekker/1/est (06.08.2026)
