Piping system background https://www.rawpixel.com/image/11513565/piping-system-backgroundView licenseSocial Media Connection https://www.rawpixel.com/image/372446/image-rawpixelcomView licenseSocial Media Connection https://www.rawpixel.com/image/372448/image-rawpixelcomView license[Untitled photo, possibly related to: Two members of threshing crew, central Ohio (see general caption)]. Sourced from the… https://www.rawpixel.com/image/12255886/photo-image-face-person-public-domainFree Image from public domain license