HERBERT 7, 9, 20 and 21 Combination Turret Lathes. Operator's Manual. HERBERT 7, 9, 20 and 21 Combination Turret Lathes. Operator's Manual. Manufacturers: Herbert Models: Herbert 7 Combination Turret Lathe Herbert 9 Combination Turret Lathe Herbert 20 Combination Turret Lathe Herbert 21 Combination Turret Lathe Contents: Operators Manual