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Subject
- Scientific apparatus and instruments12
- Bausch & Lomb Optical Company7
- Colorimetry--Instruments6
- Microscopes6
- Potentiometer6
- Test tubes6
- Beckman Instruments, Inc.5
- Colorimetry5
- Electricity5
- Leeds and Northrup Company5
- Analytical chemistry4
- Bunsen burner4
- Hydrogen-ion concentration--Measurement--Instruments4
- Laboratories--Equipment and supplies4
- Optics4
- Centrifuges3
- Analytical chemistry--Instruments2
- Biochemistry2
- Calculators2
- Chemical elements2