All contracts for material used in a manufactured product, containers, machinery, repairs, and services shall be made and executed by the director of prison industries with the approval of the secretary of corrections. Source: SL 1947, ch 265 , § 4; SDC Supp 1960, § 13.47A04; SL 1989, ch 20 , § 133; SL 1991, ch 206 , § 2.