"Recordon" magnetic disc recorder by Thermionic Products, London, c. 1949. Serial number W307911. "Recordon" magnetic disc recorder by Thermionic Products, c. 1949
Recording disc for "Recordon" magnetic disc recorder by Thermionic Products, London, c. 1949 Recording disc for "Recordon" magnetic disc recorder by Thermionic Products, c. 1949
Soundmirror tape recorder by Thermionic Products Ltd., serial no. S001090, with eleven reels of paper based tape and ACOS MIC 22 microphone, c. 1950. Soundmirror tape recorder by Thermionic Products Ltd.
