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Nikola Tesla (1856-1943), 1919. Tesla in 1919 holding a gas-filled phosphor coated wireless light bulb which he developed in the 1890's to replace incandescent lamp Stock Photo - Alamy
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Ceramic TESLA 20 Watt Digital LED Bulb with 3 Year Replacement Warranty, Base Type: E27 at Rs 199/number in Kozhikode
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