12 Powertrains, namely, engines, motors, and hydraulic cylinders, for land vehicles; [ drive gears being land vehicle parts; ] drive units comprised of at least one or more hydraulic engine or braking cylinders for land vehicles; [ gear boxes for land vehicles; driving motors for land vehicles; motor drive units, namely, driving motors for land vehicles; aeronautical apparatus, machines and appliances, namely, hydraulic braking cylinders and hydraulic braking valves; main brake cylinders; hydraulic circuits for vehicles; hydraulic servo valves being parts of vehicle braking systems; hydraulic servo valves being parts of hydraulic circuits, disc brakes, and turbines for land vehicles; hydraulic control systems for land vehicles comprised of hydraulic circuits for vehicles, hydraulic brake cylinders, hydraulic valves, and hydraulic power packs, for land vehicles; hydraulic power transmission units for land vehicles comprised of hydraulic cylinders, hydraulic valves, and hydraulic power packs; clutch cylinders for land vehicles; mechanical power transmitting mechanisms, namely, transmission mechanisms, transmissions, transmission shafts, drive shafts, clutch mechanisms, clutches, and differentials for land vehicles; motors for land vehicles; wheel cylinders for land vehicles; propulsion mechanisms for land vehicles, namely, land vehicle power train mechanisms comprised of clutch, transmission, drive shaft, hydraulic cylinder, and differential; ] steering units for land vehicles