12 Tractors, Trailers, Fork Lift Trucks, and Parts Therefor-Namely, Driver's Cabs, Safety Frames, Seats, Seat Cushions, Seat Backs, Hitches, Hitch Stabilizers, Chains and Couplings, Gears, Transmissions and Electric Starters; Weight Transfer Hitches, Wheel Weights and Mountings Therefor, Protective Covers, Caps, Lids, Grills, Screens for the Purpose of Preventing Entry of Unwanted Objects into Openings, and Air Pumps for Land Vehicle Tires