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Since 1977, the small-sized universal oscilloscope "S1-73" has been producing Lviv PO named after Lenin. The compact "C1-73" universal oscilloscope is designed to study the shapes of electrical signals in the frequency range from 0 to 5 MHz by visual observation and measuring their amplitudes from 0.02 to 120 volts, and with a divider and up to 350 V and temporary intervals up to 0.5 sec.