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Since the beginning of 1993, the frequency counter of the radio amateur "4R-02" has been producing the Chelyabinsk UNIRET. The frequency meter is assembled on chips of the KR1044IE1, KR1533 series and is designed to measure the frequencies of low and high frequencies in two sub-bands: from 1 to 9999 Hz and from 10 to 9999 kHz. A photograph of the device was sent by Igor Baturin, the city of Ufa.