USS Preston (DD-19)- St'd 2 1-2" Composition Valves Press. from 101 to 300 Lbs. - NARA - 117877262.jpg
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USS Preston (DD 19) St'd 2 1 2" Composition Valves Press. from 101 to 300 Lbs. NARA 117877262, USS Preston (DD-19), US National Archives series: Alphabetical Series of Ship Engineering Drawings, Images from the National Archives and Records Administration, US National Archives location: other, USS Preston (DD-19): St'd 2 1/2" Composition Valves Press. from 101 to 300 Lbs.
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improper fraction