Relay switch made by the Power Equipment Co. Ltd
circa 1950
Mercury switch
circa 1950
Mercury tube No. 9 for switch
Mercury tube switch
Mercury switch made by the Power Equipment Co. Ltd
circa 1950
Mercury tube No. 9 for switch
Mazda 80W glass starter switch
1950-1960
Video Switching Unit
Ferranti stall recovery switching unit
Switching unit
Ferranti switching unit
Electrode switching unit
