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set in wood box - vertical bar 15 prisms (1, 2, 3, 4, 5, 6, 8, 10, 12, 14,16, 18, 20, 25,30 dptp) - horizontal 16 prisms (1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 25, 30, 35, 40,45 dptp) - usable with all polarized tests such vectogram