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The L.E.D. Quandary: Why There's No Such Thing as “Built to Last” | The New Yorker
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U.S. Department of Energy na Twitterze: „The History of the Light Bulb: Building on past inventions http://t.co/ESOlIY5xYv http://t.co/PtM5L2iSVT” / X
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History of LED Lights - The Lightbulb Co. UK
