Photain Controls
of Leatherhead.
1974 Manufactured five photoconductive cells with a peak spectral response at 7,000 angstroms, being more sensitive at the infra-red part of the spectrum.
1974 Developed a new fire alarm control system that consisted of a control unit and a separate power pack to provide two separate alarm conditions - fault warning and fire warning.[1]
See Also
Sources of Information
- ↑ The Engineer 1974/05/30