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In page Lizzie Magie:

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Magie first made the game, known as The Landlord's Game, popular with friends while living in Brentwood, Maryland, and sought her first patent on it while living there. In 1903, Magie applied to the US Patent Office for a patent on her board game,[3] which was designed to demonstrate the economic ill effects of land monopolism and the use of land value tax as a remedy for them. She was granted U.S. Patent 748,626 on January 5, 1904.