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BS ISO 23551-9. Safety and control devices for gas burners and gas-burning appliances. Particular requirements. Part 9. Mechanical gas thermostats|Type testing, Control devices, Pressure regulators, Pressure equipment, Safety measures, Valves, Seals, Control equipment, Temperature controllers, Safety devices, Gas-powered devices, Marking, Instructions for use, Controllers, Gases, Burners, Control systems
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