CREATE TABLE table_name_18 (type VARCHAR, in_service VARCHAR, vessel VARCHAR)

What type of ship is a Kobben class vessel that has been in service longer than 2?
SELECT type FROM table_name_18 WHERE in_service > 2 AND vessel = "kobben class"
SELECT "type" FROM "table_name_18" WHERE "in_service" > 2 AND "kobben class" = "vessel"