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On 27 January, 1880 Edison was granted a patent for his electric light bulb.
The light bulb, or Edison filament lamp as it was known, has one loop of carbon filament which glows when a current of electricity passes through it.
This lamp in the Science Museum collection was made one year after Joseph Swan's original 1878-1879 electric light bulb.
But both lamps were already out of date by 1883 when Swan and Edison started their successful Edison and Swan United Electric Light Company in Britain.
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