USS Preston (DD-19)- Indicator Gear for Aux. Pumps in Fire and Engine Rooms - NARA - 117877436.jpg
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USS Preston (DD 19) Indicator Gear for Aux. Pumps in Fire and Engine Rooms NARA 117877436, 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): Indicator Gear for Aux. Pumps in Fire and Engine Rooms
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high gear leading indicator predictor