27 CFR 40.501 - Retention of permit and supporting documents.
The manufacturer must retain the permit, together with the copy of the application and supporting documents returned with the permit, at the same place where the records required by this subpart are kept. The permit and supporting documents must be made available for inspection by any appropriate TTB officer upon request.
Title 27 published on 2014-04-01
no entries appear in the Federal Register after this date.