Certificates of indebtedness:
(1) Must be in fully registered form;
(2) May be issued in denominations of one hundred dollars ($100.00) or any multiple of one hundred dollars ($100.00);
(3) Must bear interest at the rate or rates and be payable as to principal and interest at the times that the county executive determines, provided that the certificates must not mature later than ten (10) years after date of issuance; and
(4) May be exempt from all state, county and city taxation of every kind and nature whatsoever in the state. (Mont. Co. Code 1965, § 5-4; 1969 L.M.C., ch. 37, § 1; 1978 L.M.C., ch. 36, § 1; 1986 L.M.C., ch. 44, § 1.)