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Broadband and VLR coatings

Introduction of broadband and VLR (very low reflective) coatings.

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Questar advertisement, <em>Sky and Telescope</em>, March 1967
Questar advertisement, Sky and Telescope, March 1967. Questar Corporation via archive.org

Sky and Telescope, March 1967, IFC.
Sky and Telescope, April 1967, IFC.