Incandescent light bulb - The First Double-Coil bulb using a coiled coil tungsten filament

Time: 1921

Place: Japan

Details: In 1921, Junichi Miura created the first double-coil bulb using a coiled coil tungsten filament while working for Hakunetsusha (a predecessor of Toshiba). At the time, machinery to mass-produce coiled coil filaments did not exist. Hakunetsusha developed a method to mass-produce coiled coil filaments by 1936.

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