Carburettors having air or fuel-air mixture passage throttling valves other than of

Official title: having valves, or like controls, of elastic-wall type for controlling the passage, or for varying cross-sectional area, of fuel-air mixing chambers {or of the entry passage}

F02M9/10 (Carburettors having air or fuel-air mixture passage throttling valves other than of) appears on 64 US grants and 16 published applications in this corpus.