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What improvements were gradually added to Thomas Edison's original light bulb?

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Anonymous

∙ 14y ago
Updated: 8/19/2019

in 1911 tungsten was introduced as a filament. In 1913 filaments were coiled for the first time, and bulbs were filled with inert gas. Beginning in 1925, bulbs were frosted on the inside

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∙ 14y ago
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