Customs tariff amendments expand and refine import exemptions for manufacturing, petroleum operations, and specified industrial inputs. Further amendment to Notification No. 12/2012-Customs substitutes and inserts multiple Table entries specifying tariff headings, descriptions and concessional basic customs duty rates, omits certain serials, and adjusts column entries; it also revises the proviso and Annexure by omitting clauses, inserting new conditions (including textile manufacturer/importer certification and petroleum/coal bed methane importer conditions), and adds a new List (List 34) enumerating petroleum and CBM related equipment eligible under specified exemptions.