SWITCHBOARD FOR MAGNETO OR BATTERY RINGING
DROP SHUTTER INDICATORS
Consisting of Indicators, with 2 inch Aluminium Shutters and side Mechanical Replacement, mounted in solid Polished Walnut Case with
Plate-glass Front and Nickel-plated Terminals. Recommended for use in Fire Stations, Hotels, Warehouses, Hospitals and other large
For 5, 10, 15 or 20 lines.
Taken from the GEC Telephone Catalogue, K Section, 10th Edition, 1908