Potentiometer, switches and circuit breaker for electric motor, by Electric and Ordance Accessories Co. Ltd., Birmingham, 1904 Potentiometer, switches and circuit breaker for electric motor 1904
Control panel with two carbon filament light bulbs, by A. Gaiffe, Paris, 1903-1904, owned by Dr. A. Bruce, Edinburgh, 1904-1910 Control panel with two carbon filament light bulbs 1903-1904
