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| Keywords: OpticalGlass 015.jpg A 777 LBC off color B 776 1 6 2 flint C 775 1 6 5 flint note dark live __ pot bottom corrosion on ___ D 771 E 772 1 6 2 flint F 774 1 6 5 flint G probably B S C H probably B S C I B S C National Institute of Standards and Technology 5/1/1932 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Glass | ||||
