File:Morgan signal.jpg: Difference between revisions
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imported>Russell Potter (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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Latest revision as of 18:58, 11 March 2022
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