Bulgarian machine engineering company Hydraulic Elements and Systems (HES) said that it expects its sales revenue to grow 12.7% year-on-year to 58.2 million levs ($34.0 million/29.8 million euro) in the January-November period of 2018.HES expects to book 6 million levs in sales revenue in the month of November alone, the company said in a statement on Monday.In the first ten months of the year, the company's sales revenue rose by an annual 12.44% to 52.2 million levs.Last month, HES said it expects its sales revenue to total 61.6 million levs in 2018, up 11.7% on the year.HES is part of blue-chip industrial group Stara Planina Hold.