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piiratud sagedusvahemik 300 Hz kuni 3,4 kHz üle 100 aasta, limited frequency range of 300 hertz to 3,4 kilohertz for over 100 years
telefonisagedus . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/telefonisagedus/1/est (06.07.2026)
