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| Advertising set. This lovely little set of rare earth oxides was made to promote the fact that rare earths really aren't very rare. Once the technology was developed to separate and purify then economically, they became quite common in fact. There is no date on this piece which is a pity, but I would guess it was made in the 1960's. Source: SoCal (Nevada), Inc Contributor: Theodore Gray Acquired: 23 July, 2004 Price: $20 Size: 8" Purity: >20% | |||
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