Swan Centenary Commemorative Lamp; 100 w coiled-coil tungsten filament lamp with a single filament support wire
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Swan Centenary Commemorative Lamp; 100 w coiled-coil tungsten filament lamp with a single filament support wire, made by Osram (G.E.C) Ltd, and distributed at the Swan Centenary Colloquium held at the Institution of Electrical Engineers on 1st March 1979.
