27 CFR §53.103

For purposes of chapter 32 of the Code, the lease of an article by a manufacturer, producer, or importer shall be considered a sale of the article. The term lease means a contract or agreement, written or verbal, which gives the lessee an exclusive, continuous right to the possession or use of a particular article for a period of time. The term includes any renewal or extension of a lease or any subsequent lease of the article.