This chapter shall become operative on July 1, 1956, and prior thereto the city shall contract with the State Board of Equalization to perform all functions incident to the administration and operation of this sales and use tax; provided, that if the city has not contracted with the State Board of Equalization, as provided in Section 4.16.020, prior to July 1, 1956, the ordinance codified in this chapter shall not be operative until the first day of the first calendar quarter following the execution of such a contract by the city and by the state board of equalization; provided further, that this the ordinance codified in this chapter shall not become operative prior to the operative date of the uniform local sales and use tax ordinance of the county. (Ord. 444 NCS §3; prior code §23.7.)