En värld i brand: Andra världskriget och sanningenAnton Vretander
Garrett Morgan patents the three-position traffic signal - November 20th, 1923
- Af
- Episode
- 1225
- Published
- 20. nov. 2021
- Forlag
- 0 Anmeldelser
- 0
- Episode
- 1225 of 2007
- Længde
- 9M
- Sprog
- Engelsk
- Format
- Kategori
- Historie
On this day in 1923, prolific inventor and entrepreneur Garrett Morgan received the patent for a traffic light signal of his own design.
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