In the past, most milk testing associations have been formed by farmers in the higher-income brackets. This milk-tester… https://www.rawpixel.com/image/12275200/photo-image-face-person-woodFree Image from public domain license[Untitled photo, possibly related to: Production. B-17 heavy bomber. Another mighty B-17F (Flying Fortress) bomber sets out… https://www.rawpixel.com/image/12296882/photo-image-cloud-plant-skyFree Image from public domain licenseFred Ukro with corn husked for yield test. Grundy County, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12274547/photo-image-plant-person-horseFree Image from public domain licenseMobile crane lifting the top from a crate containing a United States fighter plane awaiting assembly at the assembly… https://www.rawpixel.com/image/12294677/photo-image-person-sky-planeFree Image from public domain licenseA milk tester for the Triple B milk testing associations. His equipment includes test tubes, pipettes, a centrifuge and… https://www.rawpixel.com/image/12276710/photo-image-shadow-cat-personFree Image from public domain license