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The Ledger
On this day

November 20th

1 event recorded on The Ledger.

  1. 1923
    The Rise

    Traffic-signal patent granted

    The U.S. Patent Office grants Garrett Morgan U.S. Patent 1,475,024 for a three-position traffic signal. General Electric buys the rights for $40,000.

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Timeline data: 159 events across The Ledger. See the full 400-year timeline →