Respirators other than for artificial respiration; supplied air respirators other than for artificial respiration; cartridges, filters, head and neck straps, peel-off lens covers, clamp nozzles, hose clips, exhalation valves, exhalation valve guards, voice transmitting diaphragms, nozzles with voice transmitting diaphragms, lens replacements, pressure gauges, and pressure relief valves for respirators, all for use with respirators other than for artificial respiration sold together as a unit ...