In 1921, Kent produced his first radio components, selling the do-it-yourself kits consisting of "breadboards" that could be assembled by early radio enthusiasts. The same year, he introduced the "Model 5", primarily as a promotional tool. In 1923, his firm started producing complete radio sets, using a facility on Stenton Avenue, introducing the "Model 10" for Christmas that year. This was followed by the "Model 9" "and a broad line of breadboard sets". In 1924, the company moved to a new $2 million plant at 4745 Wissahickon Avenue in North Philadelphia. This plant, constructed in sections, would eventually cover .