Three Cadmium sulphide photo cells
1960-1965
D.86679 type photo-cell for picture transmission
Photo-cell, caesium-oxygen-silver cathode of modern type
MRK Selenium Photo Cell (c.1960)
1960
RCA photo-cell type UX 868, gas-filled thin film caesium
2A type photo-cell for talking film recording
Secondary emission photo-cell
3A type photo-cell for talking film reproduction
