Auxiliary duty exemption on machinery parts for initial setup allows duty limited to the rate applicable to the complete article, subject to conditions. Exempts from excess auxiliary customs duty component parts of machinery imported for initial setting up, assembly, or manufacture of specified articles, limiting the exemption to the excess over the duty leviable on the complete article; requires proof to the Assistant Collector of Customs that parts are so required and makes the exemption subject to the conditions of Notification No. 155/86-Customs.