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Measuring, regulating, control and checking (supervision) apparatus, vacuum measurement apparatus; Laboratory devices with vacuum chambers for experimenting, etching, coating in a vacuum; Leak detectors, helium leak detectors, leak detectors for detecting leaks in vacuum containers and airtight containers; Leak test instruments and leak test systems consisting thereof; Leak testers; Air-operated leak testers; Leak detectors; Leak detection apparatus; Vacuum leak detecting devices; Leak detection devices; Electricity conduits; Sightglasses, being checking (supervision) and measuring instrumente; Measuring, regulating, checking (supervision) and control apparatus for vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems, vacuum pumping stations (other than parts of machines); Automatic vacuum control apparatus; Testing apparatus; Measuring, regulating, checking (supervision) and control apparatus for gas inlets; Data interfaces for vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems; Pressure or vibration systems; Sensor measuring systems; Software for diagnosing vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems; Apparatus for testing vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems; Apparatus for testing the drive trains of vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems; Apparatus for testing fittings for vacuum pumps (machines), namely oil separators, condensate separators, dust separators, cooling radiators, filters, steam condensers, flanges and control apparatus; Apparatus for testing valves; Apparatus for testing vacuum-tight, mechanical and electric ducts, namely electricity ducts, thermal element ducts, fluid ducts, pipe ducts, rotary ducts; Apparatus for testing automatic valves for gas inlets (parts of machines); Apparatus for adjusting vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems; Apparatus for adjusting the drive trains of vacuum apparatus, in particular vacuum pumps (machines), pressure measuring pipes, vacuum measuring pipes, valves, gas flow regulating systems; Apparatus for adjusting fittings for vacuum pumps (machines), namely oil separators, condensate separators, dust separators, cooling radiators, filters, steam condensers, flanges and control apparatus; Apparatus for adjusting valves; Apparatus for adjusting vacuum-tight, mechanical and electric ducts, namely electricity ducts, thermal element ducts, fluid ducts, pipe ducts, rotary ducts; Apparatus for adjusting automatic valves for gas inlets (parts of machines)