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Disclosures on a precipitation indicator, moisture detector, vacuum ball valve, film strip printer, normal incidence interferometer, color sorter, and coaxial T. Editors::David Robbins and Alvin J. Englert., , National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NBS.TN.263
(Accessed October 14, 2024)