9 Electromechanical, mechanical, electrical, electronic, optical and thermal sensors and controls for use in measuring, detecting and indicating temperature or overheat; optical scanners and sensors for detecting light-obscuring substances; gas detectors, flame detectors and smoke detectors; fire extinguishers; gauges, valves and meters for use in relation to the monitoring, measuring, charging and refilling of containers and cylinders with gas, including compressed gas; fire alarms; fire blankets; safety equipment, namely fire escape ladders; fire hose nozzles; fire sprinklers; fire trucks; oxygen masks not for medical use; life belts; life jackets; life nets; life preservers; life-buoys; life-saving rafts