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african american inventor|Black History|Black Mail Blog|Philip B Downing|Street Letter box
Philip B. Downing: Mailbox Inventor
October 28, 2015
Philip B. Downing: Invented The Street Letter Box in 1891. Click the link to learn more.
October 28, 2015Philip B. Downing: Invented The Street Letter Box in 1891. Click the link to learn more.