Title: Ėlektromodelirui͡ushchie pribory dli͡a rascheta ventili͡at͡sionnykh seteĭ; tekhnika rascheta shakhtnykh ventili͡at͡sionnykh seteĭ metodam ėlektricheskogo modelirovanii͡a
Subjects: Electromechanical analogies, Mine ventilation