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NEW MODEL 6 2 1 I R SPECTROPHOTOMETER PROVIDES OPTIMUM ENERGY TRANSFER OVER ENTIRE 4000-200 CM RANGE In the Model 621 Filter-Grating* Infrared Spectrophotometer, Perkin - Elmer — world leader in infrared —has achieved a new level of performance over the instrument's total operating range: from 4000 to 200 cm"1. Fundamental to this additional per
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