USS Henley (DD-39)- 3" Automatic Balanced Float Valve - NARA - 75841906.jpg
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USS Henley (DD 39) 3" Automatic Balanced Float Valve NARA 75841906, USS Henley (DD-39), US National Archives series: Alphabetical Series of Ship Engineering Drawings, Images from the National Archives and Records Administration, US National Archives location: other, USS Henley (DD-39): 3" Automatic Balanced Float Valve
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ballcock balanced