NAVIGATION
Sodium chloride crystal optic rectangle, 41mm x 23mm x 6mm, polished both sides
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Potassium bromide crystal optic rectangle, 41mm x 23mm x 6mm, polished both sides
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Calcium fluoride crystal optic rectangle, 41mm x 23mm x 6mm, polished both sides
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Silver chloride crystal optic disc, 13mm x 1mm, polished both sides
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Silver chloride crystal optic disc, 13mm x 2mm, polished both sides
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Silver chloride crystal optic disc, 25mm x 2mm, polished both sides
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