Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking being supervision, life-saving and teaching apparatus and instruments, namely, conductivity meters, surveying machines and instruments, photographic cameras, cinematographic projectors, optical cables, scales and balances, measuring cups, signaling buoys, baby monitors, emergency flares, and medical teaching mannequins; apparatus for conducting, switching, transforming, accumulati...