Electric monitoring devices and apparatus for monitoring torsional vibrations

Electronic surveillance apparatus and instruments, especially for the surveillance of torsional vibrations, namely, computer and computer hardware, vibration sensors, inductive sensors, angular encoders, vibration meters

machine parts, namely, torsional vibration dampers and shaft couplings, not for land vehicles; components of transmission systems for marine vehicles and aircraft, namely, transmission shaft couplings and torsional vibration dampers