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A detector located on a positioning tray has a plurality of colored caps placed by a subject being tested. Each cap has a unique resonant circuit which is selectively energized to indicate cap position to the detector so that color discrimination of the subject may be determined.
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The Curators of the University of Missouri, Columbia, MO
Bassi, Carl; Howe, Michael; and Garver, Wayne, "Device and method for determining a cap arrangement indicating color discrimination" (2013). UMSL Patents. 19.