Pennington's motorcycles never progressed past the prototype stage. Excelsior Motor Company, originally a bicycle-manufacturing company based in Coventry in Warwickshire (England), began production of their first motorcycle model in 1896, available for purchase by the public. The first production motorcycle in the US was the Orient-Aster, built by Charles Metz in 1898 at his factory in Waltham, Massachusetts. In 1898, Peugeot Motocycles presents at the Paris Motorshow the first motorcycle equipped with a Dion-Bouton motor. Peugeot Motocycles remains the oldest motorcycle manufacturer in the world. In the early period of motorcycle history, many producers of bicycles adapted their designs to accommodate the new internal-combustion engine. As the engines became more powerful and designs outgrew the bicycle origins, the number of motorcycle producers increased. Many of the nineteenth-century inventors who worked on early motorcycles often moved on to other inventions. Daimler and Roper, for example, both went on to develop automobiles. At the turn of the 20th century the first major mass-production firms emerged. In 1901 English quadricycle- and bicycle-maker Royal Enfield introduced its first motorcycle, with a 239 cc engine mounted in the front and driving the rear wheel through a belt. In 1898 English bicycle-maker Triumph decided to extend its focus to include motorcycles, and by 1902 the company had produced its first motorcycle—a bicycle fitted with a Belgian-built engine. A year later it was the largest motorcycle-manufacturer, with an annual production of over 500 units. Other British firms included Norton and Birmingham Small Arms Company who began motorbike production in 1902 and 1910, respectively. In 1901 the Indian Manufacturing Company, which had been founded by two former bicycle-racers, designed the so-called "diamond framed" Indian Single, whose engine was built by the Aurora Firm in Illinois per Indian's specifications. The Single was made available in the deep blue. Indian's production was up to over 500 bikes by 1902, and would rise to 32,000, its best ever, in 1913. Indian produced over 20,000 bikes per year. The oldest surviving Russian-manufactured motorcycle, the Rossiya, dates from 1902. The American company Harley-Davidson started producing motorcycles in 1903. During this period, experimentation and innovation were driven by the popular new sport of motorcycle racing, with its powerful incentive to produce tough, fast, reliable machines. These enhancements quickly found their way to the public's machines. Chief August Vollmer of the Berkeley, California Police Department is credited with organizing the first official police motorcycle-patrol in