https://rubinobservatory.org/news/furnace-open
Giant Furnace Opens to Reveal 'Perfect' LSST Mirror Blank | Rubin Observatory
The single-piece primary and tertiary mirror blank cast for the LSST is "perfect", say project astronomers and engineers.
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https://epragueknives.com/vtg-explorer-seki-japan-tak-fukuta-4-625-mirror-fixed-knife-making-blade-blank/
Vtg Explorer Seki Japan Tak Fukuta 4.625" Mirror Fixed Knife Making Blade Blank - ePrague, LLC
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