27 CFR § 19.292 - Notice of operations.
(a) Beginning operations. A proprietor must file a letterhead notice with the appropriate TTB officer before beginning or resuming production operations. A proprietor must not begin or resume operations before the time specified in the notice.
(b) Suspending operations. If a proprietor intends to suspend production operations for a period of 90 days or more, the proprietor must file a letterhead notice with the appropriate TTB officer specifying the date on which operations will be suspended.
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