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14 Okt 1878 Jahr - Edison filed his first patent application

Beschreibung:

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.

Zugefügt zum Band der Zeit:

The Life Of A Lightbulb

By(STUDENT)Autumn Parham
20 Feb 2018

Datum:

14 Okt 1878 Jahr
Jetzt
~ 145 years ago
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