Liquid Ring Vacuum Pumps Compressors and Systems : gas physics and vacuum technology, machines for vacuum generation, liquid ring vacuum pumps and liquid ring compressors, vacuum and compressor plants with liquid ring machines, components for pump units with liquid ring vacuum pumps and compressors, design of vacuum pumps and pipework, assembly and testing of vacuum pumps and systems, materials, surface treatment and safety-at-work in vacuum engineering, explosion protection and explosion-proof electrical equipment, temperature classes.