https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12306786Edit ImageSaveSaveEditCropCustom TextThreading machine (bars are used for concrete reinforcements in Army camp). Gichner Iron Works, Washington, D.C.. Sourced from the Library of Congress.View public domain image source hereMorePublic DomainFree CCO U.S. Government image for Personal and Business useInfoView CC0 LicenseEditorial use only JPEGTIFFSmall JPEG 1200 x 1020 px | 300 dpiLarge JPEG 3500 x 2976 px | 300 dpiBest Quality JPEG 4806 x 4087 px | 300 dpiTIFF 4806 x 4087 px | 300 dpi | 18.76 MBFree DownloadThreading machine (bars are used for concrete reinforcements in Army camp). Gichner Iron Works, Washington, D.C.. Sourced from the Library of Congress.More