Training. Work Projects Administration (WPA) vocational school. This small cabin plane is being completely overhauled by… https://www.rawpixel.com/image/12306982/image-person-plane-fabricFree Image from public domain licenseConversion. Copper and brass processing. When "slabs" (brass or copper castings in the form of long flat cakes) are cast… https://www.rawpixel.com/image/12306820/image-person-factory-blackFree Image from public domain licenseSubstitute materials. Timber connectors. Constructed of wood reinforced with timber connectors, this 166 foot wide clear… https://www.rawpixel.com/image/12303689/image-sky-templates-woodFree Image from public domain licenseDenver, Colorado. Interior of a once-abandoned railroad machine shop, now producing fabricated steel parts for the hulls of… https://www.rawpixel.com/image/12302530/image-person-wood-factoryFree Image from public domain licenseDenver, Colorado. Two ingenious American steel fabricators who "took a quick look at a blue print and in less time than it… https://www.rawpixel.com/image/12302772/image-person-art-goldFree Image from public domain licenseDenver, Colorado. Workers giving ship steel a thorough rinsing after it has been "pickled" in the highest steel "pickling"… https://www.rawpixel.com/image/12302761/image-plant-person-airplaneFree Image from public domain licenseDenver, Colorado. Piles of steel plate and steel beams, from Pennsylvania in a converted railroad yard where they are being… https://www.rawpixel.com/image/12302560/image-person-sky-factoryFree Image from public domain license[Untitled photo, possibly related to: Pre-fabricated house at Greenbelt, Maryland] by Russell Lee https://www.rawpixel.com/image/12147705/image-plant-art-vintageFree Image from public domain license