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I'm with you. What were people in the early 1900's using rare earth metals for that they would be used up by now?


The first large-scale use of the rare-earth metals was since the last decade of the 19th century in gas lamps with high brightness, which were used especially for street lighting in Europe, until they were replaced by electric lamps.

The next large-scale use appeared soon after the start of the 20th century, in the portable lighters, which are still used today.




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