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fotoelektriline otsenäiduspektrograaf metallide koostiselementide sisalduse mõõtmiseks, fotoelectric spectroscope for chemical analysis
quantum meter . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/quantum%20meter/1/eng (07.07.2026)