S1-18 (Dvukhluchevoj oscillograf) 1972
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The two-beam oscilloscope "C1-18" was produced presumably since 1972. The oscilloscope "C1-18" is designed for simultaneous investigation of the form of two low-frequency electrical processes by visual observation or photographing. A detailed description of the oscilloscope - in the documentation.
Documentation:
Information from collection of Valery Khartchenko