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1. OA 58-66B

   … abrasion and wear resistance against sand and minerals … OA 58-66B … 14700: T ZFe14 …

2. AA 66B

   … excelent abrasion and wear resistance against sand and minerals … AA 66B … 14700: T Fe16 …

3. OA 62-66B

   … abrasion and wear resistance against sand and minerals. … OA 62-66B … 14700: T Fe15 …