27 CFR § 19.91 - Operating permit.
(1) Distill for industrial use;
(2) Warehouse spirits for industrial use;
(3) Denature spirits;
(4) Warehouse spirits (without bottling) for nonindustrial use;
(6) Manufacture articles; or
(b) Exception. The requirement to obtain an operating permit does not apply to an agency of a State, or political subdivision of a State, or an officer or employee of, and acting for, such an agency.