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optical boratglas good chemical bestaendigkeit with negative abnormal teildispersion and brechzahlen n deep e between 1.65 and 1.79 and abbe numbers ny deep e between 40 and 30 and a procedure for its manufacture
optical boratglas good chemical bestaendigkeit with negative abnormal teildispersion and brechzahlen n deep e between 1.65 and 1.79 and abbe numbers ny deep e between 40 and 30 and a procedure for its manufacture
