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The first light bulb had a filament made of _____.

The first light bulb had a filament made of _____.
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The first light bulb had a filament made of _____.

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User Grumdrig
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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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User CGN
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