TRACTORS ADAPTED TO BE EMPLOYED IN FARMING OPERATIONS, ROAD BUILDING, MINING, LOGGING, EARTH MOVING, HAULING, AND FOR OTHER INDUSTRIAL AND AGRICULTURAL PURPOSES; INTERNAL COMBUSTION ENGINES ADAPTED FOR EMPLOYMENT AS THE SOURCE OF POWER FOR SELF-PROPELLED VEHICLES, AND AS STATIONARY OR PORTABLE POWER UNITS FOR INDUSTRIAL AND AGRICULTURAL USES; POWER AND MANUALLY CONTROLLED GRADERS, TERRACERS, PLANERS, SCARIFIERS, LEANING WHEEL GRADERS, ELEVATING GRADERS, SCRAPERS, BULLDOZERS, LEVELERS, PLOWS, DITCHERS, BANK CUTTERS , AND BACK SLOPERS ADAPTED TO BE EMPLOYED FOR THE CONSTRUCTION AND MAINTENANCE OF ROADS, FOR MOVING AND REMOVING OF EARTH, SNOW, AND LIKE MATERIALS, FOR PREVENTING SOIL EROSION AND FOR OTHER INDUSTRIAL AND AGRICULTURAL USES; HARVESTERS, COMBINE HARVESTERS, MOWERS, PUSH RAKES, WINDROW HEADERS AND WINDROW PICK-UPS; IMPLEMENT HITCHES; PARTS AND TOOLS FOR ALL OF SAID PRODUCTS AND ATTACHMENTS, ACCESSORIES AND EQUIPMENT ASSOCIABLE WITH ALL OF SAID PRODUCTS.