Scientific, nautical, surveying, electric, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments (included in this class); apparatus and instruments and systems arranged therefrom for receiving, recording, transmission, processing and/or reproduction of analog and/or digital video signals (images) and/or analog and/or digital audio signals (sound) and/or data, respectively including apparatus and ins...