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14 окт 1878 г. - Edison filed his first patent application

Описание:

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.

Добавлено на ленту времени:

The Life Of A Lightbulb

By(STUDENT)Autumn Parham
20 фев 2018

Дата:

14 окт 1878 г.
Сейчас
~ 145 г назад
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