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14 out 1878 ano - Edison filed his first patent application

Descrição:

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.

Adicionado na linha do tempo:

The Life Of A Lightbulb

By(STUDENT)Autumn Parham
20 fev 2018

Data:

14 out 1878 ano
Agora
~ 145 years ago
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