USS Hartford (1858)- Type of Strengthening of Boiler Saddles - NARA - 75841782.jpg
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USS Hartford (1858) Type of Strengthening of Boiler Saddles NARA 75841782, USS Hartford (ship, 1859), US National Archives series: Alphabetical Series of Ship Engineering Drawings, Images from the National Archives and Records Administration, US National Archives location: other, USS Hartford (1858): Type of Strengthening of Boiler Saddles
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strengthening stiffening strengthener reinforcement strengthen