Publication Details (including relevant citation information): Apparatus for Measuring Electrolytes Utilizing Optical Signals Related to the Concentration of the Electrolytes. John G. Pumphrey, Benton A. Durley, III, Paul E. Garrett, Edward G. Pumphrey, Charles L. Davis, Frederic L. Clark, Lawrence Spritzer, US Patent Number 5,001,417, March 19, 1991.
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