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Valves to irrigation gates. Main irrigation canal in Maricopa County, Arizona by Russell Lee https://www.rawpixel.com/image/12143791/image-plant-art-vintageFree Image from public domain license
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Hart (vicinity), Missouri. The conductor uses his air valve in emergencies when it is necessary for him to stop the train… https://www.rawpixel.com/image/12337074/image-face-hand-peopleFree Image from public domain license
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