The following tutorial will show you around the part 478 landing page.
27 CFR Part 447
Importation of Arms, Ammunition and Implements of War
27 CFR Part 478
Commerce in Firearms and Ammunition
27 CFR Part 479
Machine Guns, Destructive Devices, and Certain Other Firearms
27 CFR Part 555
Commerce in Explosives
27 CFR Part 646
Contraband Cigarettes
27 CFR Part 771
Rules of Practice in Explosive License and Permit Proceedings
Effective date is the date this part was last amended
No refund of any part of the amount paid as a license fee shall be made where the operations of the licensee are, for any reason, discontinued during the period of an issued license. However, the license fee submitted with an application for a license shall be refunded if that application is denied or withdrawn by the applicant prior to being acted upon.