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215 years does not seem like a long time. But that was when John Ericsson was born on July 31, 1803 He lived a full life, and died on March 8, 1889. But in his lifetime, his effect on Propeller Design, Steam Power at Sea, and the Revolving Turret revolutionized sea power in the mid-1800s. He truly was a great inventor and an Agile Thinker. We in Philadelphia note his accomplishments, as did…