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important engineers in history, important mechanical engineers in history, most influential engineers in history, famous engineers and what they invented, engineers in the military history, famous civil engineers in history, who was the first engineer in history, who are famous engineers, famous engineers and inventors, famous mechanical engineers in history, list of famous engineers, engineers in the early united states, most famous engineers of all time, famous people who were engineers, what have engineers invented, great engineers of all time, greatest engineers of all time, who was known as the great engineer, famous engineers and their inventions, what are engineers known for