develop petrol and diesel engines during the 1930s, with experimental rear-engined buses being built. By the 1940s experiments with, and production of under-floor engined single-deck buses take place. Experiments and developments of independent front suspension, air suspension, rubber suspension, glass fibre construction and disc brakes take place during the 1950s. 1959 sees the introduction of a turbocharged coach capable of almost 100 mph, for non-stop motorway services. High speed (motorway) buses are developed with passenger toilets. During the 1960s BMMO becomes the first British bus company to make wide-scale use of computers in compiling bus schedules and staff rosters. 1932: The Birmingham Sound Reproducers company is set up in the West Midlands. In the early 1950s, Samuel Margolin begins buying auto-changing turntables from BSR, using them as the basis of his Dansette record player. Over the next twenty years, "Dansette" becomes a household word in Britain. By 1957, BSR has grown to employ 2,600 workers. In addition to manufacturing their own brand of player—the Monarch Automatic Record Changer that could select and play 7", 10" and 12" records at 33, 45 or 78 rpm, changing between the various settings automatically—BSR McDonald supplied turntables and autochangers to most of the world's record player manufacturers, eventually gaining 87% of the market. By 1977, BSR's various factories produced over 250,000 units a week. 1932: Leonard Parsons is the first to use synthetic vitamin C as treatment for scurvy in children. 1933: Credenda Conduit Co. Ltd of Birmingham patent a Credastat automatic oven thermostat, which is fitted to Creda electric cookers. This is an early advancement in electric cookers and a feature that eventually becomes standard on all electric cookers. An example of this cooker is on display at the London Science Museum. 1934: The Reynolds Tube Company introduces the double-butted tube-set 531 for high strength but lightweight bicycle frames. Reynolds 531 remains for many years at the forefront of alloy steel tubing technology and is used to form the front subframes on the Jaguar E-Type during the 1960s. Before the introduction of more exotic materials such as aluminium, titanium or composites, Reynolds is considered the dominant maker of high end materials for bicycle frames. According to the company, 27 winners of the Tour de France have won riding on Reynolds tubing. 1935: Birmingham has a long history of toy and trinket manufacture and in 1935 the biggest toy makers in England, Chad Valley,