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- Colorimetry[remove]12
- Colorimetry--Instruments8
- Scientific apparatus and instruments6
- Bausch & Lomb Optical Company3
- Beckman Instruments, Inc.3
- Colorimetric analysis3
- Spectrum analysis3
- Absorption spectra2
- Analytical chemistry2
- Colors2
- Dow Chemical Company1
- Duboscq, J. (Jules), 1817-18861
- Employees1
- Geary, James1
- Industries1
- Keuffel & Esser Co.1
- Klett Manufacturing Company1
- Klett, Robert E.1
- Laboratories1
- Light1