Cecil Schumacher built his business on 12th cars, starting back in 1981. First it was a lexan car (here) the XL, and then the C Car (here) bith of which were very successful in Europe

Cecil Schumacher invented the ball differential in about 1980, and although it said 'Patent Pending' on the parts, he never did get a patent. Cecil was a gearbox engineer, and he used a design from a gear checking machine as the basis for his design. IT is Cecil's original design that has been copied by everyone else. HTH