NOSE AND MOUTH RESPIRATORS, GOGGLE RESPIRATORS PROTECTING EYES, NOSE, AND MOUTH, [ SAND-BLAST HELMETS, ] WELDING HELMETS, [ BAG-HOUSE HELMETS, ] DUST HOODS, FACE MASKS, ACID MASKS, [ BABBITTING MASKS, CHIPPING MASKS, ] PURE-AIR MASKS, AND PURE-AIR RESPIRATORS