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14 oct 1878 año - Edison filed his first patent application

Descripción:

The patent was for "Improvement In Electric Lights". He continued to test several types of material for metal filaments to improve upon his original design.

Añadido al timeline:

The Life Of A Lightbulb

By(STUDENT)Autumn Parham
20 feb 2018

fecha:

14 oct 1878 año
Ahora mismo
~ 145 years ago
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