Respirators for medical purposes; respiratory protection apparatus for medical purposes, namely, respiratory masks for medical [ or surgical ] purposes; the foregoing being for protection against airborne hazards for use by medical or surgical staff or other persons located within medical or surgical facilities and not being patient treatment devices

Anti-pollution masks for respiratory protection; filters for respiratory masks; filters for use in respiratory masks; filters for use with respiratory apparatus; filters for use with respiratory face masks; powered respirators (other than for artificial respiration); respirators (other than for artificial respiration); respirators for filtering air; respirators for protective purposes; respiratory apparatus, other than for medical use; respiratory gas blending apparatus, other than for medica...