Letterhead application.
Letterhead application. A letter on a company's letterhead or other piece of paper that clearly shows the company name from a company representative with signature authority. A letterhead application is subject to TTB approval prior to any change requested in the letter.
Source
27 CFR § 19.1
Scoping language
As used in this part, the following terms shall have the meanings indicated unless either the context in which they are used requires a different meaning, or a different definition is prescribed for a particular subpart, section, or portion of this part: