This Day in History – October 21, 1879

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19th century technology,

American inventors,

carbonized filament,

Edison's laboratory,

electric incandescent lamp,

historical milestones,

history of electricity,

Industrial Revolution,

invention of the light bulb,

lighting history,

Menlo Park New Jersey,

October 21 1879,

scientific breakthroughs,

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this day in history 1879,

this day in history October 21 1879 history,

Thomas Edison,