The control, operation, tolls and other revenues of the Delaware Memorial Bridge and its approaches, and all of the real and personal property appurtenant thereto or used in connection therewith, shall vest in the Department subject to the rights of the holders of outstanding Delaware Memorial Bridge Revenue Bonds of the State issued prior to July 27, 1955, under the authority of 45 Del. Laws, c. 275 as amended, and the State covenants that the control, operation, tolls and other revenues of said Delaware Memorial Bridge, its approaches and all real and personal property appurtenant thereto or used in connection therewith shall remain vested in the Department so long as said bonds or any bonds issued under the authority of this chapter shall remain outstanding and unpaid, or until all of the Delaware Memorial Bridge Revenue Bonds issued under authority of 45 Del. Laws, c. 275 as amended, have been paid in full or provision shall have been made for the payment thereof in the manner provided by the indenture between the Department and the Equitable Trust Company of Wilmington, Delaware, dated June 1, 1948, and the supplemental indentures between said Department and said Equitable Trust Company, dated June 1, 1951 and January 1, 1952, securing the payment of the Delaware Memorial Bridge Revenue Bonds now outstanding. The Delaware Memorial Bridge shall be operated and extensions and improvements made thereto and the tolls and revenue derived therefrom accounted for and applied in strict conformity with said indenture and supplemental indentures.