9 Dust masks; Dust protective masks; Protective industrial respiratory masks, other than for artificial respiration; Filters for non-medical respiratory masks; Anti-pollution masks for respiratory protection; Respirators for filtering air in the nature of protective industrial respirators; Respirators, other than for artificial respiration, namely, respirators for the prevention of accident or injury; scientific, research, navigation, surveying, photographic, cinematographic, audiovisual, optical, weighing, measuring, signalling, detecting, testing, inspecting, life-saving and teaching apparatus and instruments, namely, computer hardware; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling the distribution or use of electric current; apparatus and instruments for recording, transmitting, reproducing or processing sound, images or data; mechanisms for coin-operated apparatus; cash registers; calculating devices, namely, calculators; computers and computer peripheral devices; diving suits, divers' masks, ear plugs for divers, nose clips for divers and swimmers, gloves for divers, breathing apparatus for underwater swimming; fire-extinguishing apparatus