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B-10    11110 B-12    11113 BV-15 ..

Prisms sets - birefringent S-4 11034   5-10-15-20 S-8 11038 2@ 5-10-15-20..

Square prisms Sizes 1/2-1-2-3-4-5-6-7-8-9-10-12-14-15-16-18-20-25-30-35-40-45-50     35-40-45-50..