1) Big European brand 2) Big German brand 3) European brand 4) European international brand 5) Famous European brand 6) Famous German brand 7) German brand 8) German international brand 9) Glass type 10) Major European brand 11) Major German brand
Found on
https://www.crosswordclues.com/clue/zerodur
Zerodur (notation of the manufacturer: ZERODUR®), a registered trademark of Schott AG, is a lithium aluminosilicate glass-ceramic produced by Schott AG since 1968. It has been used for a number of very large telescope mirrors including Keck I, Keck II, and SOFIA. With its very low coefficient of thermal expansion it can be used to produce mirrors...
Found on
http://en.wikipedia.org/wiki/Zerodur
(from the article `telescope`) ...better materials for mirrors have become available. Cer-Vit, for example, was used for the 4.2-metre William Herschel Telescope of the Roque de ...
Found on
http://www.britannica.com/eb/a-z/z/6
No exact match found.
