Oregon Revised Statutes Food and Other Commodities: Purity, Sanitation, Grades, Standards, Labels, Weights and Measures § 625.120

The distributor's numbered license certificate shall be kept posted conspicuously at the licensee's principal public place of business within this state. The licensee shall also cause to be displayed conspicuously on the outside of each vehicle used by the licensee in distribution of bakery products the statement “State Bakery Distributor's License No._____,” including the proper license number. In event of revocation or suspension of the license, the certificate shall be surrendered by the licensee to the State Department of Agriculture promptly upon demand.