In 1968, Beckman's Advanced Technology Operations group introduced the MINOS Dissolved Oxygen Meter (DOM), capable of measuring dissolved oxygen in seawater at depths of 3,000 meters.
The photograph of the instrument held above the water (2012-002_1300) is in the public domain and depicts the successful use of the DOM by naval oceanographers.
Attribution is reasonably certain for the photograph of arrayed components and bottle, but not the other photographs.
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Beckman Instruments Photographic Services Section. “Dissolved O2 Monitor (DOM),” circa 1969. Beckman Historical Collection, Box 58, Folder 18. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/7s75dc83b.
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