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A milk tester for the Triple B milk testing associations. His equipmen...
Public domain photograph of laboratory, free to use, no copyright restrictions image - Picryl description
Removing samples of cream from centrifuge used in Babcock test for but...
Public domain photograph of 1930s industry, war production in the United States free to use, no copyright restrictions image - Picryl description
Wright-Patterson Air Force Base, Area B, Building 55, Centrifuge Build...
Picryl description: Public domain image of park architecture, palace, chateau, open space, 18th, and 19th-century architecture, free to use, no copyright restrictions.
Salinas, California. Placing treated and rinsed guayule seed in centri...
Public domain photograph of California in 1930s, free to use, no copyright restrictions image - Picryl description
Salinas, California. Treated and rinsed guayule seed is placed in cent...
Picryl description: Public domain image of a factory worker, plant, manufacture, assembly line, industrial facility, early 20th-century industrial architecture, free to use, no copyright restrictions. show less