Dennis Kunkle spotted an interesting light bulb glowing dimly in the basement of the Fire Museum of York County on West Market Street in York. Kunkle, director of facilities for the York County History Center, sent pictures and a description of the old bulb to an antique radio forum. That's how Kunkle learned about the origin of this fully functional dual filament bulb.
100-year-old light bulb discovered in York
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