The owner or operator shall prominently display, at all locations where unattended coin-operated devices are displayed for customer use in the city, complete instructions for reporting to him the failure of any such device to function properly. Said instructions shall include the name and either the address or telephone number of the person, firm, corporation, or organization responsible for operation. It shall be the duty of the owner or operator of said devices to rebate all money paid for commodities or services not received, but the owner or operator may elect to check the device before making any rebate; provided that the device must be checked promptly, so that a rebate to which a customer is entitled will be made within 10 days from the time he applies for it. (Ord. 13795)