23 INDUSTRIAL TRACTORS, VEHICLE ENGINES, CYLINDER HEADS, PISTONS AND POPPET VALVES THEREFOR, VEHICLE POWER TRANSMISSIONS, VEHICLE DRIVING AXLE SHAFTS, SNOW PLOWS, VEHICLE ENGINE CYLINDER HEAD WATER OUTLETS, WINCHES, FOUR-WHEEL-DRIVE ATTACHMENTS FOR CONVERTING A TWO-WHEEL-DRIVE TRUCK INTO A FOUR-WHEEL-DRIVE TRUCK, VEHICLE-SUPPORTED COMBINATION PLOW AND DOZER, VEHICLE-SUPPORTED COMBINATION PLOW, DOZER AND SHOVEL, VEHICLE-SUPPORTED OIL PUMP, AUTOMOTIVE AND INDUSTRIAL GEARS AND TRANSMISSIONS, REAR AND DRIVING AXLES AND AXLE PARTS, AND DRIVE LINE AND UNIVERSAL JOINT PARTS