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Subject
- Corporations105
- Chemical industry96
- Water purification chemicals industry95
- Dearborn Chemical Company94
- Employees69
- Scientific apparatus and instruments66
- Laboratories57
- Glassware29
- Water--Testing24
- Water--Analysis13
- Machinery11
- Water10
- Perkin-Elmer Corporation9
- Women employees9
- Beckman Instruments, Inc.8
- Water quality--Measurement7
- Balances (Weighing instruments)6
- Offices6
- Atomic absorption spectroscopy5
- Barrels5