The Commission is authorized to issue one or more interim bonds, representative of the bonds so sold, which said interim bonds may be in any denomination, shall have all the qualities and be secured by all of the covenants and pledges made to secure the bonds so sold, but said interim bonds shall represent the bonded debt only until such time as the definitive bonds are printed, executed and delivered to the purchaser thereof. No tender of any such interim bonds shall be valid until the expiration of the period of contestability provided in this act. Simultaneously with delivery of the definitive bonds, any such interim bonds shall be surrendered for cancellation and canceled by the State Treasurer of Oklahoma.