The same year he founded the company W. Hellesen. In 1889 he sold his first batteries to the DanishTelephone Company. The same year a young chemist Valdemar Ludvigsen came to the factoryhelping by the further development of the batteries. When Frederik Hellesen died in 1892 his widow took over the company with the help of Ludvigsen. In 1906 V. Ludvigsen became the sole owner of the factory with the name A/S Hellesens Enke & V. Ludvigsen., now defunct.