1 Jin Sangtae Jin Sangtae Subscribe Unsubscribe 8h ago8h ago Subscribe Unsubscribe Щодня record 1 minute a day and repeat. - 1st waveform : 20151020 ~ 20190926 - 2nd waveform : 20190926 ~ 20230923 - 3rd waveform : 20230924 ~ … continue reading