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Keyword: refractor
![Рефрактор мемориальной обсерватории им. Кросбай Рэмсея](https://images.astronet.ru/pubd/2004/08/16/0001199281/crm_observatory_big.preview.jpg)
14.01.1999
The Massachusetts-based firm of Alvan Clark and Sons became famous for making telescope optics near the end of the last century. Near the end of this century, major astronomical observatories still boast of telescopes...
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