Customs duty amendment substitutes the list of petroleum sector equipment subject to revised effective rates and conditions. Amendment to Notification No. 11/97 Customs substitutes List 12 to define goods for which the effective rates of standard and additional customs duty for Chapters 1-99 are changed. The substituted List 12 specifies equipment and materials used in petroleum exploration, drilling, production, pipeline laying and associated offshore/onshore services, including seismic and drilling rigs, vessels, platform equipment, pipes, valves, safety and pollution control systems, spare parts and technical documentation.