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- Beckman Instruments, Inc.49
- Scientific apparatus and instruments48
- Hydrogen-ion concentration--Measurement--Instruments45
- Hydrogen-ion concentration11
- Electrodes10
- Electrodes, Glass9
- Celluloid7
- California Fruit Growers Exchange5
- Noyes, Arthur A. (Arthur Amos), 1866-19365
- Scientific apparatus and instruments--Design and construction5
- California Institute of Technology4
- Pressure gages4
- Silver films (Metal coating)4
- Silvering4
- Metal coating3
- Scientific apparatus and instruments--Marketing3
- Sunkist Growers, inc.3
- Beckman, Arnold O.2
- Buildings2
- Coors Porcelain Company2