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aastane talitluskestus päevavalguse olemasoluta, annual operating hours during the non-daylight time
talitluskestus päevavalguse puudumise ajal . Valgustehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//valgus/talitluskestus%20p%C3%A4evavalguse%20puudumise%20ajal/1/est (05.08.2026)