File:Morgan signal.jpg: Revision history

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11 March 2022

11 May 2007

  • curprev 14:4514:45, 11 May 2007‎ imported>Russell Potter‎ 311 bytes +311‎ Patent drawing for Garrett A. Morgan's traffic signal, US patent 1,475,024, Nov. 20 1923. Retrieved directly from the US Patent and Trademark Office. Copyright law (17 U.S.C. § 105) states that all materials created by the United States government are in the public domain.
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