Word: rittler
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Dates: during 1970-1979
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...Ferree, 84, who with her late husband Dr. Clarence Ferree made major strides in the study of human vision; in Stony Brook, N.Y. Co-holder of a dozen patents for lighting devices, optical and ophthalmological instruments, she played a major role in the development of the famed Hardy-Rand-Rittler color plates (numerals outlined by dots in subtly shaded hues) universally used to identify types of color deficiency and color blindness...
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