9 Electric and electronic apparatus and instruments for measuring, testing, regulating, monitoring and checking sound and vibration, namely, vibration meters, electro-technical vibration meters, sound and vibration analyzers, acoustic analyzers, electro- acoustic analyzers, structural dynamics analyzer, hand- held vibration analyzer, sound level meters, noise dose meters, noise monitoring terminals, acoustic transducers, vibration transducers, accelerometers, calibration systems for monitoring and diagnosis of sound volume, quality and frequency and for monitoring and diagnosis of sound volume; electronic apparatus for measuring vibrations; apparatus for controlling and monitoring machines; scientific, natural, surveying, photographic, cinematographic, optical, weighing, measuring, signalling and checking (supervision) apparatus and instruments, namely, cameras; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, apparatus for recording, transmission or reproduction of sound or images, magnetic data carriers, recording discs, calculating machines, data processing equipment and computers