9 Scientific, navigation, surveying, photographic, film, optical, weighing, measuring signaling, control, life-saving and teaching apparatus and instruments, namely, microscopes, compasses, protractors, cameras, magnifying glasses, telescopes, graduated rulers, emergency flares, optical lenses, scales, signaling buoys, lifesaving rafts; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; electrical sensors for the determination of physical and chemical properties; detectors, in particular gas detectors; integrated circuit chips; data processing equipment and computers; computer software for use by electric sensors; detectors, namely, gas detectors for detecting the presence of gas; stored computer operating programs