Edward E. Rosen and Co
1920 Edward E. Rosen set up Edward E. Rosen and Co, making wide-frequency-response headphones, with a new factory in Devonshire Square, London EC2.
1921 The success of the headphones meant a larger premises was needed and a new factory at 158-160 City Road, London, EC, was taken on. Started to produce horn loudspeakers. This was a lucrative move as both shop-bought and home-built receivers needed horn loudspeakers to work.
1923 The firm expanded again into new factory (6,500 sq. ft.) at Harrow Road, London, and employed 20 people initially. Started to build the philosophy of in-house vertical integration by manufacturing components from raw materials.
1924 Marketed the Beco (British Electric Manufacturing Co) magnetic-reed type moving iron loudspeaker, the first British commercial moving iron loudspeaker. Named the Ultra.
1925 Ultra Electric Ltd was formed. Edward also changed his surname to Rose to try and disassociate himself from his background, though the wireless world continued to use his original, familiar one. Products ranged from loudspeakers, pickups, battery eliminators and a portable receiver.