The country's manufacturing sector witnessed an improvement in sales growth in the third quarter this fiscal on annual basis, though net profit has remained subdued due to lack of support from other income, says a RBI data on performance of private corporate sector. The RBI data released on Monday said the information technology (IT) sector recorded a modest improvement in sales growth, although lower than a year ago. The services (non-IT) sector showed signs of revival as reflected by positive sales growth, it added.