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oct 14, 1878 - Edison filed his first patent application

Description:

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.

Added to timeline:

The Life Of A Lightbulb

By(STUDENT)Autumn Parham
20 Feb 2018

Date:

oct 14, 1878
Now
~ 145 years ago
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