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Subject
- Rare earths7
- Auer v. Welsbach, Carl (Auer von Welsbach), 1858-19295
- Incandescent gas-lighting5
- Rare earth industry5
- Welsbach Gas Light Company5
- Incandescent gas-lighting--Fixtures4
- GTE Sylvania Incorporated3
- Lighting3
- Sylvania Electric Products, Inc.3
- Cathode ray tubes2
- Employees2
- Europium2
- Gas-lighting2
- Incandescent lamps2
- Machinery2
- Rare earth phosphates2
- Television picture tubes2
- Television--Receivers and reception2
- Women employees2
- Chemical elements1