Bibliography Details

“Questar Duplex, Zerodur, Broadband.” Astromart, February 2, 2010. https://astromart.com/classifieds/astromart-classifieds/telescope-catadioptric/show/questar-duplex-zerodur-broadband-pending-david.

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§ 4.2. New Accessories and Design Refinements

§ 5.1. Product Refinements

Timeline