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  • Canada
    Friday Jul 24, 1874

    Incandescent light bulb

    Canadian Patent was filed

    Canada
    Friday Jul 24, 1874

    On 24 July 1874, a Canadian patent was filed by Henry Woodward and Mathew Evans for a lamp consisting of carbon rods mounted in a nitrogen-filled glass cylinder. They were unsuccessful at commercializing their lamp, and sold rights to their patent (U.S. Patent 0,181,613) to Thomas Edison in 1879.




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