Increase in base oil prices Petrolube provided copies of telexes from Luberef indicating that the base oil prices had been increased with effect from 1 September 1990 and 15 October 1990.
395. Petrolube提供的Luberef的电报复印件表明，从1990年9月1日至1990年10月15日，基础油价格上涨。