A licensed public weighmaster shall keep and preserve for at least one year, or for a longer period as may be specified in the regulations authorized to be issued for the enforcement of this chapter, a legible carbon copy of each weight certificate issued by that public weighmaster. The copies must be open at all reasonable times for inspection by the state sealer or a sealer.   [RR 2023, c. 2, Pt. C, §56 (COR).]