Reliance Telephone Co
of Parker Street, London.
1919 Private company.
1961 Manufacturers and installers of telephone systems, staff locators, electric clock and time recording systems. 
1967 Combined with AEI's Private Telephone business; became part of GEC-AEI Telecommunications
Sources of Information
- GEC, its History, Structure and Future by T. W. Heather. 1953
- 1961 Dun and Bradstreet KBE