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ava metallurgiaseadmes protsessi kulgemise jälgimiseks, an aperture in the wall of a furnace, protected with a glass or mica plate, making it possible to observe the processes occuring in the furnace
гляделка . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/%D0%B3%D0%BB%D1%8F%D0%B4%D0%B5%D0%BB%D0%BA%D0%B0/1/rus (21.06.2026)
