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Laser marking machine marks codes on glasses frames - Laser marking, welding and cutting machine | Triumphlaser
Why is your prescription engraved into the lenses of your glasses when it disrupts having a clear view vision? - Quora
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Laser etched “T” on transition glasses. Is this new procedure to put an etched letter on the line of sight? There are 2 Ts on each lens. One T on the left
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