Show visible numbers D devised ased innovations or adapt adaptations adaptation atio s to new uses of existing Ins instruments instrument trumen are with out end in the building industry an interesting application of luminous material to house numbers Is now being made this Is a number deeply embossed in fin an aluminum plaque the upper tipper surface being coated with lilack black enamel and baked the lower surface receiving a scratch brush finish they then the center portion Is coated with it i good quality of radium luminous material this Is then in an aluminum frame with clear glass |