APDO

Gas masks; respirators for filtering air; teaching robots; respiratory masks, other than for artificial respiration; dust masks; protective masks; non-medical respiratory mask filters; oxygen sensors, not for medical use; non-medical respiratory monitors; scuba masks; wearable computers; ear phones; resuscitation training simulators; aqualungs; headphones; anti-pollution masks for respiratory protection; breathing masks; filters for respiratory masks; breathing apparatus, except for artificial respiration