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According to Assembly line#History, the earliest mass production assembly line was created at Portsmouth Block Mills around 1801-03, and there was another one in 1853 at the Long Shop making steam engines. These are firmly in the First Industrial Revolution, not the second as listed in this graphic. Third Industrial Revolution is a redirect to Digital Revolution, which has little to say about manufacturing, and doesn't mention robotic automation. As far as I know, there is no consensus among economic historians that a "Fourth Industrial Revolution" is happening, and Wikipedia is not a crystal ball and should not be predicting that future historians would agree that this happened. Given these issues, I think this graphic is misleading enough that it should not be used. -- Beland (talk) 20:33, 17 June 2019 (UTC)[reply]
