Stepper finder SHI-25/4 (Red Dawn)

Step finder SHI-25/4 (Leningrad production association Krasnaya Zarya) NOT ONLY for telephone decade-step stations (ATS), BUT ALSO FOR radio engineering, telemechanics and electromechanics, in electromechanical devices: for opening doors and gates, for dosing materials during their packaging, for dosing fuels and lubricants, in various automatic devices