All bonds issued under the provisions of this Division shall be signed in the name of the county by the chairman of the county board and shall be countersigned by the county clerk and shall have the seal of the county attached thereto. Such bonds shall mature at such time or times as is fixed by said county board provided that all of such bonds shall mature within 20 years from their date and bear interest at not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, payable annually or semi-annually, and may be sold as the county board may direct at not less than par and accrued interest, and the proceeds derived from the sale thereof shall be used solely and only for the payment of such claims, or the bonds may be exchanged par for par for such claims, such bonds may be delivered from time to time or all at one time.
     With respect to instruments for the payment of money issued under this Section or its predecessor either before, on, or after the effective date of Public Act 86-4, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Division or “An Act to authorize any county having a population of less than 5,000 to issue funding bonds and to provide for the validation of claims to be paid by or from the proceeds of such bonds, and to provide for a tax to pay the principal and interest of said bonds”, approved August 15, 1961, that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section or its predecessor are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section or its predecessor within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Division or “An Act to authorize any county having a population of less than 5,000 to issue funding bonds and to provide for the validation of claims to be paid by or from the proceeds of such bonds, and to provide for a tax to pay the principal and interest of said bonds”, approved August 15, 1961, that may appear to be or to have been more restrictive than those Acts.