type A: ER11-A, ER16-A, ER20-A

    type B: ER25-B, ER32-B, ER40-B, ER50-B

    type M: ER8-M, ER11-M,ER16-M,ER20-M,ER25-M

    type T1: ER11-T1, ER16-T1, ER20-T1, ER20-T1

    type T2: ER25-T2, ER32-T2, ER40-T2, ER50-T2