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BTU indicators; and electro-mechanical monitors and controls for liquefied petroleum gas fuel supply plants

liquid petroleum gas and ammonia electric vaporizers; liquid petroleum gas and ammonia gas fired vaporizers; gas-air mixers; liquid pumping units comprised of a liquid pump, an electric motor, a motor starter, relief and bypass valves, strainers, and pressure and temperature gauges; liquefied petroleum gas fuel supply plants; and liquefied petroleum gas filters to remove entrapped oil