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In page John Ericsson:

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The relations between Ericsson and Stockton had grown tense over time and, approaching the completion of the ship, Stockton began working to force Ericsson out of the shipbuilding project. Stockton carefully avoided letting outsiders know that Ericsson was the primary inventor.[citation needed] Stockton attempted to claim as much credit for himself as possible, even designing a second 12 in (300 mm) gun to be also mounted on the Princeton. Unfortunately, because Stockton did not totally understand the design of the first gun (originally named "The Orator", renamed "The Oregon" by Stockton), the second gun was fatally flawed.