Scientific, research, navigation, surveying, photographic, cinematographic, audiovisual, optical, weighing, measuring, signaling, detecting, testing, inspecting, life-saving and teaching apparatus and instruments, namely, neutron detectors and particle accelerators; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electricity, namely, particle beam emitter in the nature of light beam emitters; apparatus and i...