Gorgeous 1934 SONOFON 'remote receiver' in full working condition. Sought after by Danish collectors. Sonofon was a Danish radio and electronics factory founded in 1921, which started with coils and from 1927 produced radios, including construction kits.. Famous tube radios from the 1940s, such as the Sonofon 475 and 413, are today sought-after collector's items. Note: There are two companies with the name, this radio factory being from 1921, while the telecommunications company (later Telenor) is from 1991. Sonofon Radio Factory:Founding: Established in 1921 by engineers Kjeld Prytz and Viggo Berthelsen.Production: Started with "PB Coils", but switched to radio production in 1927.Products: Known for quality tube radios in the 1940s and 50s. Examples include the Sonofon 475 from circa 1948, known for its warm sound, and the Model 413 from 1940.Design: Also produced larger radio furniture.