This Article shall become operative on July 1, 1956 and prior thereto this City shall contract with the State Board of Equalization to perform all functions incident to the administration and operation of these sales and use tax regulations; provided, that if this City shall not have contracted with the State Board of Equalization, as above set forth prior to July 1, 1956, this Article 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, that this Article shall not become operative prior to the operative date of the Uniform Local Sales and Use Tax Ordinance of the County.