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First SubmarineOctober 1902: A model of the first ever British submarine, the Holland No. 1 (named after inventor John Philip Holland) on display in Trafalgar Square, London
Power Wheelcirca 1900: Actual power wheel used by railways engineer George Stephenson to drive a lathe at Killingworth Colliery, Northumberland. (Photo by Kirby/Topical Press Agency/Getty Images)