Revenue bonds may be issued under this article in one or more series; may bear such date or dates; may mature at such time or times, not exceeding 40 years from their respective dates; may bear interest at such rate or rates not exceeding 9 percent per annum, payable at such time or times; may be payable in such medium of payment at such place or places; may be in such denomination or denominations; may be in such form, either coupon or registered; may carry such registration, conversion, and exchangeability privileges; may be subject to such terms of redemption, with or without premium; may be declared or become due before the maturity date thereof; may be executed in such manner; and may contain such terms, covenants, assignments, and conditions as the resolution or resolutions authorizing the issuance of such bonds may provide. All bonds issued under this article bearing the signature of officers in office on the date of the signing thereof shall be valid and binding, notwithstanding that before delivery thereof and payment therefor such officers whose signatures appear thereon shall have ceased to be officers of the governmental body issuing the bonds. Pending the preparation of the definitive bonds, interim receipts, in such form and with such provisions as the governing body may determine, may be issued to the purchaser or purchasers of bonds to be issued under this article. Such bonds and interim receipts shall be negotiable for all purposes. Such bonds shall be and are declared to be nontaxable for any and all purposes.