RacheleMurnan RacheleMurnan

04-09-2014
History

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The first light bulb had a filament made of _____.

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mashenka mashenka

04-09-2014

Filament of the first light bulb was made of carbonized piece of cotton. It was invented by Thomas Edison in 1879 and the lifetime of this light bulb was approximately 13 hrs.

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