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Subject
- Auer v. Welsbach, Carl (Auer von Welsbach), 1858-19295
- Cathode ray tubes2
- Chemical elements1
- Chemists1
- Cigarette cards1
- Electrooptics1
- Employees2
- Europium2
- Factories1
- GTE Sylvania Incorporated3
- Gas-lighting2
- Incandescent gas-lighting5
- Incandescent gas-lighting--Fixtures4
- Incandescent lamps2
- Industries1
- Interior lighting1
- International Union of Pure and Applied Chemistry1
- Lasers1
- Light pollution1
- Lighting3