Personal respiratory equipment for protection against airborne atmospheric contaminates, namely self-contained open and closed circuit breathing apparatus, entry and escape tyres, supplied air respirators full face and half face masks, pressure demand and hose types, and parts and accessories thereof; supplied air respirators full face, half face and hood type constant flow airline respirators, parts and accessories thereof; personal respiratory equipment for protection against airborne atmospheric contaminants, namely air purifying full face, half face and hood type powered air purifying filter respirators, filters for particulates, gas and combinations of particulates and gases, disposable filtering face-piece types, parts and accessories thereof; gas detection equipment for the detection and measuring of toxic, combustible and explosive gases, namely portable personal gas detectors and fixed gas detection and measuring equipment and parts and accessories thereof