Strowger step-by-step PABX3 private automatic branch exchange as modified for use at Holmsted Manor, Cuckfield, West Sussex, made by Standard Telephones and Cables Limited, British, 1955-1965. Strowger step-by-step PABX3 private automatic branch exchange, 1955-1965 1955-1965
Section of CB1 manual telephone exchange switchboard from the Enfield telephone exchange, 1925-1960 1925-1960