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Specifications for an Improvement in Electric Lamps

Thomas Edison’s handwritten specifications for an Improvement in Electric Lamps, 11/01/1879 (detail)
On November 1, 1879, Thomas Edison applied for a patent for an "Improvement in Electric Lamps,", including this eight page handwritten specification. On January 27, 1880, Edison received the historic patent embodying the principles of his incandescent lamp that paved the way for the universal domestic use of electric light.
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Today’s Document from the National Archives

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