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                   Raspberry Pi Board History

• February 2012: Raspberry Pi 1 Model B (Rev. 1)
• April 2012: Raspberry Pi 1 Model B (Rev. 2)
• February 2013: Raspberry Pi 1 Model A
• July 2014: Raspberry Pi 1 Model B+
• November 2014: Raspberry Pi 1 Model A+
• February 2015: Raspberry Pi 2 Model B
• November 2015: Raspberry Pi Zero
• February 2016: Raspberry Pi 3 Model B
• February 2017: Raspberry Pi Zero W
• March 2018: Raspberry Pi 3 Model B+
• -------  2019: Raspberry Pi 4

        https://en.wikipedia.org/wiki/Raspberry_Pi