"Sauter" electric semi-storage heater, part sectioned to reveal 1 of 6 heating elements in iron box sunk in concrete, 3 heat settings to tot al of 4KW with storage period of 3 hours, installed as experiment in D un Laoghaire Telephone Exchange, near Dublin in 1938, French, 1938 "Sauter" electric semi-storage heater 1938
