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- A.C. Gilbert Company1
- Absorption spectra1
- Adam Hilger Ltd.1
- Agates1
- American Optical Corporation1
- Ammeters1
- Analytical chemistry4
- Analytical chemistry--Equipment and supplies1
- Analytical chemistry--Instruments2
- Applied Physics Corporation1
- Auer v. Welsbach, Carl (Auer von Welsbach), 1858-19291
- Babcock, S. M.1
- Badische Anilin- & Soda-Fabrik1
- Bausch & Lomb Optical Company7
- Beckman Instruments, Inc.5
- Beckman Instruments, Inc. Spinco Division1
- Biochemistry2
- Blood gases1
- Blowpipe1
- Bunsen burner4