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On written petition of a consumer the Bureau of Weights and Measures may inspect and test any gas, electric or water meter which has been installed or put in service, where it is shown that the said meter has registered, without apparent cause therefor, an excess of twenty-five percent (25%) or more over the normal monthly expense represented by the average for the last six months. History —June 19, 1919, No. 60, p. 328, § 5, eff. 90 days after June 19, 1919.