All service stations utilizing card lock or key-type fuel dispensing mechanisms shall have within thirty to fifty feet from the dispensing mechanism an emergency shut-off switch which is at all times readily accessible and identifiable to the operator of the dispensing mechanism. All such devices shall also have adequate information detailing the method of reporting complaints or equipment malfunctions. This information shall include the name, address and phone number of the local servicing agency for the device and be conspicuously displayed on each service island. (Ord. 172-71 § 13.)