NAVIGATION
Silver chloride crystal optic disc, 32mm x 3mm, polished both sides
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Zinc selenide crystal optic disc, 13mm x 1mm, polished both sides
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Calcium fluoride crystal optic disc, 38mm x 6mm, polished both sides
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Potassium chloride crystal optic disc, 38mm x 6mm, polished both sides
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Sodium chloride crystal optic disc, 38mm x 6mm, polished both sides
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Sodium chloride crystal optic disc, 13mm x 2mm, unpolished
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