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NSK S-Max M95L Electric optic contra angel F/O handpiece fit Kavo Aseptico Nouvag Star Bien Air Made in Japan

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Humboldt State University ® Department of Chemistry Robert A. Paselk Scientific Instrument Museum The Chemical Refractometer 1874 - 1970 Richard A. Paselk, Curator Refractometry has been a major tool in the chemical laboratory to determine concentrations of solutions and as an aid in identifying unknown substances since the late nineteenth century.