3xx boules furnaces are working fine and producing proper sapphire. largest were developing in stage and developed only for apple not for other customers because they had 3xx boules one working fine for others. apple is complaining that 5xx boules furnaces had problems because those were built but never tested because apple pushed to expand production. plus if apple vendor did not do proper finishing in china then sapphire will be defective by the time apple receive. blame also goes to finishing company because they did not do proper work.
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