No bill for gas and electricity or steam furnished to the City may be paid by any department in the City unless the Department of General Services has certified the rate as correct. The Department of General Services has general supervision of the gas, electric, and steam meters in all departments of the City. City Code, 1950, art. 22, §20(4th sen.) 1966, art. 17, §20(4th sen.) 1976/83, art. 17, §19(5th sen.) Ord. 46-590 Ord. 76-056 Ord. 15-435