281524 Gears and gearing/ ball or roller screws/ gear boxes and other speed changers

28152432 Gear boxes for stationary equipment, spur and helical gear boxes 28152433 Gear boxes ..., bevel and bevel/spur and helical gear boxes 28152434 Gear boxes ..., worm gear boxes 28152440 Other gear boxes 28152450 Gearboxes and other speed changers for machinery and land/sea vehicles excluding gears and gearing 28152473 Ball or roller screws 28152475 Other transmission elements (excluding gears and gearing, ball or roller screws, gearboxes and other speed changers)