CREATE TABLE table_name_29 (hull_no VARCHAR, commissioned__decommissioned VARCHAR)

Name the hull number of Commissioned Decommissioned of 1973 1996
SELECT hull_no FROM table_name_29 WHERE commissioned__decommissioned = "1973–1996"
SELECT "hull_no" FROM "table_name_29" WHERE "1973–1996" = "commissioned__decommissioned"