CREATE TABLE table_name_13 (year_s__of_manufacture VARCHAR2, quantity VARCHAR2, type VARCHAR2)

Which Year(s) of manufacture has a Quantity of 2, and a Type of b n2t?
SELECT year_s__of_manufacture FROM table_name_13 WHERE quantity = 2 AND type = "b n2t"
SELECT "year_s__of_manufacture" FROM "table_name_13" WHERE "b n2t" = "type" AND "quantity" = 2