140571 ⎘
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 other specific means for controlling the passage, or for varying cross-sectional area, of fuel-air mixing chambers; Axially movable throttle valves concentric with the axis of the mixture passage the throttle valves having mushroom-shaped bodies