140557 ⎘
Carburettors having air or fuel-air mixture passage throttling valves other than of butterfly type ; Carburettors having fuel-air mixing chambers of variable shape or position having throttling valves, e.g. of piston shape, slidably arranged transversely to the passage with means for varying cross-sectional area of fuel spray nozzle dependent on throttle position Automatically and not automatically controlled throttle valves operating mutually