Air filters for mechanical purposes; Carburetors; Clutches, other than for land vehicles; Crank shafts for engines; Cylinders for machines; Filters for motors and engines; Freewheels, other than for land vehicles; Gasoline engines not for land vehicles; Ignition parts for internal combustion engines, namely, condensers; Ignitions parts for internal combustion engines, namely, points; Pistons for engines; Pistons for cylinders; Silencers for motors and engines; Sparking plugs for internal comb...