from handsome purpose-built premises at Speedometer House, 179-185 Great Portland Street ("Motor Row"). The premises in the Strand became a Lyons tearoom, but the jewellers' establishments were retained at Trafalgar Square and 68 Piccadilly. By this time, motor accessories production included Smiths multiple-jet carburettors (designed by Trier & Martin), lighting sets, headlamps, sidelights, tail lights, dynamo and electric starters, generators and the Smith's Auto-Clear mechanical horn. On 21 July 1914, Smiths Group was floated on the London Stock Exchange; the organisation has been present on the exchange for over one hundred years. First half of 20th century The outbreak of the First World War in 1914 contributed to Smiths Group making gains in multiple markets around the world that had been previously held by the German competition. By 1915, new contracts issued by the British War Office for aeroplane accessories, lighting sets, and munitions required the speedy erection of a new freehold factory. This new factory, known as Cricklewood Works, was built at Cricklewood, north London. In 1921, the firm's Great Portland Street activities were moved to Cricklewood following the purchase of the former Metallurgique works alongside their Cricklewood Works. During the Interwar period, the company's accessories became standard fittings in new cars all provided by the manufacturer. At the start of the 20th century, the age of the early automobiles, Smith & Sons retailed one of the first British odometers ("mileometer") and speedometer. In the 1930s, Smiths agreed a trading deal with British rival manufacturer Lucas whereby the two would not compete in certain areas, while Lucas took on part of Smiths non-instrumentation assets. Smiths became the dominant supplier of instruments to British motorcar and motorcycle firms. These later 20th century instruments carried a distinctive logo, the word "SMITHS" centred above the middle of the dial and silk screened onto it in a unique house font familiar to generations of drivers. During 1919, the distribution rights for the KLG Sparking Plug were purchased from Kenelm Lee Guinness. Smiths purchased 75 per cent of Ed. Jaeger (London) Ltd in 1927 (which became British Jaeger Instrument Company in 1932). Also in 1927, Smiths purchased the KLG Sparking Plug Company (Robinhood Engineering). The Jackall hydraulic jacking system was manufactured from 1935 by Smith's Jacking Systems and immediately became standard equipment in many popular cars. In 1937, a separate aircraft and marine department was created in the parent company and named Smiths Aircraft