the original idea behind these was to suposedly revolutionise reversable ploughing , bit like the centerbeam mower, designed to work either side of the tractor,the plough would be used like a normal plough , but unlike a normal reversable which swings over , this one just moved side ways to the desired setting , as it swung to the opposite side , a mechanical linkage would move the mould boards to the right place , bit like a self leveling loader . have seen one used at a display in 89/90 ?, but not known anyone who has farmed properly with them .