Mich. Admin. Code R. 460.2549 - Charts and demand meter record cards; retention period
Rule 49. Maximum demand, pressure, temperature, and specific gravity charts and demand meter record cards shall be retained for a period of 1 year, except that if charts are exchanged with the customer and the basic chart information is transferred to another record, the charts need only be retained 6 months if the record containing the basic data is retained 1 year.
Notes
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