I have wondered for a long time about these and tonight I got to find out a bit about them. Has a 3 1/2 inch vapouriser. It has copper bands that I can not tell if they are very thin or that is what the heat does. The copper has melted in parts. The bits. The decals. The patent is one of the rare ones that the picture is exactly the same as the product. Dated 28/5/1946 Espacenet - Original document And the working shots. Neils one is here Now to find a buggered fridge.