9 Diving equipment, namely diving helmets, regulators, head protectors, masks, mask bags, cold water neck dams, deck breathing gas controller, breathing valves, exhaust valves, rebreathers, underwater life support system used in scuba diving comprised of mask, regulator and tank sold separately and as a unit, non-recreational underwater life support system used in scuba diving comprised of helmet, demand breathing regulators, deck breathing gas controller, breathing valves, exhaust valves, and umbilical cord, sold separately and as unit, and spare parts for same