active 1904-1948, optical instrument maker (spectroscopes etc.), London, England Adam Hilger Limited 1904 - 1945
1903-1922, 1963-present, railway company and heritage railway, Wales Welshpool & Llanfair Light Railway 1903 - 1922
1900-1995, manufacturer of earthenware; manufacturer of majolica, Stoke on Trent, England Grimwades Limited 1900 - 1995
1906-1971, car manufacturer; aero engine manufacturer, Derby; Bristol, England, British Rolls-Royce Limited 1904 - 1973
1901-1950 (when line closed), railway company, Queenborough to Leysdown Sheppey Light Railway 1901 - 1950
1903-1972, archaeologist; palaeoanthropologist, Kenyan; British Leakey, Louis Seymour Bazett 1903 - 1972
1901-1937, tramways company, British Isle of Thanet Electric Tramways & Lighting Company Limited 1901 - 1937
1901-1968, painter; printmaker; scenographer; poster artist, French Cassandre, Adolphe Mouron 1901 - 1968
active about 1904-1949, manufacturer of pharmaceutical and veterinary preparations, London, England Willows, Francis, Butler and Thompson Ltd 1904 - 1949