- 標準光学研磨（Standard Polishing grade)
- 寸法公差 ±0.1mm（Tolerance ±0.1mm）
- 材質：フッ化マグネシウム
- Orientation 無印 (no remarks)= Random cut Perp. To C=C直角
- 無印 ＝ 両面研磨 (Both faces polished) B/P ＝ 片面研磨 (One face polished only)
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