An industry source has revealed that six companies have received letters approving their duty-free export of 500,000 tonnes of crude palm oil (CPO) until June this year. Primary Industries Minister Datuk Seri Dr Lim Keng Yaik revealed last December that selected businesses would be able to export 1 million tonnes of CPO duty-free this year, and "the next tranche will be allocated after June," he said yesterday (1 February).